[Validator] Convert objects to string in comparison validators. Reapplies 6cf5e0812e6f20d60acbc0324abf96475e89b6ef
[Form] Fixed FormValidator compatibility with the non-BC 2.5 Validation API
[DoctrineBridge] Changed UniqueEntityValidator to use the 2.5 Validation API
[Validator] Removed legacy validator classes
minor #11587 [Validator] Removed legacy validator classes (webmozart)

This PR was merged into the 2.5 branch.

Discussion
----------

[Validator] Removed legacy validator classes

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

This PR removes the legacy validator classes again and adds the API checks inside the constraint validators instead.

Commits
-------

e844ed0 [Validator] Removed legacy validator classes
Allow basic auth in url. Improve regex. Add tests.
[Validator] Fix little typo in ExecutionContextInterface::buildViolation() method comments
bug #11559 [Validator] Convert objects to string in comparison validators (webmozart)

This PR was merged into the 2.3 branch.

Discussion
----------

[Validator] Convert objects to string in comparison validators

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

In the [latest merge from 2.3 into 2.4](/symfony/symfony/commit/3bed1b7988e94a897a64c6a2ad3bf70bde9005c1), the changes from 6cf5e0812e6f20d60acbc0324abf96475e89b6ef in 2.4 got lost. This PR brings back these changes and backports them to 2.3.

The change is BC, because the former value `true` of the `$prettyDateTime` will be cast to `1`, which corresponds to the `PRETTY_DATE` format constant.

Commits
-------

273671e [Validator] Convert objects to string in comparison validators. Reapplies 6cf5e0812e6f20d60acbc0324abf96475e89b6ef
[Validator] Backported constraint validator tests from 2.5
Merge branch '2.3' into 2.4

* 2.3:
  [Validator] Backported constraint validator tests from 2.5
  Fix toolbar vertical alignment.
  [HttpFoundation] MongoDbSessionHandler supports auto expiry via configurable expiry_field
  [FrameworkBundle] add missing attribute to XSD
  Allow basic auth in url. Improve regex. Add tests.
  fix typos and syntax in Profiler controller method comments
  remove volatile tests
  [Console] fixed style creation when providing an unknown tag option
  [Validator] Convert objects to string in comparison validators. Reapplies 6cf5e0812e6f20d60acbc0324abf96475e89b6ef
  [HttpFoundation] Update QUERY_STRING when overrideGlobals

Conflicts:
	src/Symfony/Bridge/Doctrine/Tests/Validator/Constraints/UniqueValidatorTest.php
	src/Symfony/Component/HttpFoundation/Tests/RequestTest.php
	src/Symfony/Component/Validator/Constraints/AllValidator.php
	src/Symfony/Component/Validator/Constraints/CollectionValidator.php
	src/Symfony/Component/Validator/Tests/Constraints/AbstractComparisonValidatorTestCase.php
	src/Symfony/Component/Validator/Tests/Constraints/CallbackValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/EqualToValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/FileValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/GreaterThanValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/IdenticalToValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/ImageValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/LessThanOrEqualValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/LessThanValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/NotEqualToValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/NotIdenticalToValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/UrlValidatorTest.php
[Validator] Backported constraint validator tests from 2.5
Merge branch '2.4' into 2.5

* 2.4:
  [Validator] Backported constraint validator tests from 2.5
  [Validator] Backported constraint validator tests from 2.5
  Fix toolbar vertical alignment.
  [HttpFoundation] MongoDbSessionHandler supports auto expiry via configurable expiry_field
  [FrameworkBundle] add missing attribute to XSD
  Allow basic auth in url. Improve regex. Add tests.
  fix typos and syntax in Profiler controller method comments
  remove volatile tests
  [Console] fixed style creation when providing an unknown tag option
  [Validator] Convert objects to string in comparison validators. Reapplies 6cf5e0812e6f20d60acbc0324abf96475e89b6ef
  [HttpFoundation] Update QUERY_STRING when overrideGlobals

Conflicts:
	src/Symfony/Bridge/Doctrine/Tests/Validator/Constraints/UniqueEntityValidatorTest.php
	src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/xml/full.xml
	src/Symfony/Component/Console/Tests/Formatter/OutputFormatterTest.php
	src/Symfony/Component/Form/Tests/Extension/Validator/Constraints/FormValidatorTest.php
	src/Symfony/Component/Security/Core/Tests/Validator/Constraints/UserPasswordValidatorTest.php
	src/Symfony/Component/Validator/Constraints/AllValidator.php
	src/Symfony/Component/Validator/Constraints/ChoiceValidator.php
	src/Symfony/Component/Validator/Constraints/CollectionValidator.php
	src/Symfony/Component/Validator/Constraints/ExpressionValidator.php
	src/Symfony/Component/Validator/Tests/Constraints/AbstractConstraintValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/AllValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/BlankValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/CallbackValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/CardSchemeValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/ChoiceValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/CollectionValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/CountValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/CountryValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/CurrencyValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/DateTimeValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/DateValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/EmailValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/ExpressionValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/FalseValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/FileValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/GroupSequenceTest.php
	src/Symfony/Component/Validator/Tests/Constraints/IbanValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/ImageValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/IpValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/IsbnValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/IssnValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/LanguageValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/LengthValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/LocaleValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/LuhnValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/NotBlankValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/NotNullValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/NullValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/RangeValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/RegexValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/TimeValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/TrueValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/TypeValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/UrlValidatorTest.php
	src/Symfony/Component/Validator/Tests/Fixtures/StubGlobalExecutionContext.php
Merge branch '2.5'

* 2.5: (37 commits)
  [Validator] Backported constraint validator tests from 2.5
  [Validator] Backported constraint validator tests from 2.5
  [DIC] Fixed: anonymous services are always private
  Fix toolbar vertical alignment.
  [HttpFoundation] MongoDbSessionHandler supports auto expiry via configurable expiry_field
  [Validator] Fix little typo in ExecutionContextInterface::buildViolation() method comments
  fix dependencies on HttpFoundation component
  [FrameworkBundle] add missing attribute to XSD
  Allow basic auth in url. Improve regex. Add tests.
  fix typos and syntax in Profiler controller method comments
  resolve parameters before the configs are processed
  add symfony/yaml suggestion to composer.json
  [HttpKernel] added an analyze of environment parameters for built-in server.
  remove volatile tests
  [Console] fixed style creation when providing an unknown tag option
  change command to which available under most unix systems
  add way to test command under windows
  fix shell command injection
  [Form] allowed CallbackTransformer to use callable
  [Process] Added process synchronization to the incremental output tests
  ...

Conflicts:
	src/Symfony/Component/Form/Extension/Validator/Constraints/FormValidator.php
	src/Symfony/Component/HttpKernel/Kernel.php
	src/Symfony/Component/HttpKernel/composer.json
	src/Symfony/Component/Validator/Constraints/AllValidator.php
	src/Symfony/Component/Validator/Constraints/CollectionValidator.php
	src/Symfony/Component/Validator/Constraints/LegacyAllValidator.php
	src/Symfony/Component/Validator/Constraints/LegacyCollectionValidator.php
	src/Symfony/Component/Validator/Tests/Constraints/FileValidatorTest.php