CSRF warning docs on Request::enableHttpMethodParameterOverride()

[HttpFoundation] fixed the docs so that it gives some explanation about how you are vulnerable to CSRF when you enable the httpMethodeParameterOverride
Removed fixed height from profiler resume box.
[Form] fix form handling with unconventional request methods like OPTIONS
[Config] fix filelocator with empty name
[DependencyInjection] use inheritdoc for loaders
[Validator] Fixed Regex::getHtmlPattern() to work with complex and negated patterns
[Form] Fixed usage of "name" variable in form_start block
bug #12291 [Form] Fixed usage of "name" variable in form_start block (webmozart)

This PR was merged into the 2.5 branch.

Discussion
----------

[Form] Fixed usage of "name" variable in form_start block

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #10192
| License       | MIT
| Doc PR        | -

Commits
-------

5839832 [Form] Fixed usage of "name" variable in form_start block
[TwigBundle] minor #12309 fix markup twbs inline radio button
[Routing] serialize the compiled route to speed things up

This also makes the CompiledRoute implement Serializable in order to:
1. make the serialization format shorter
2. have no null bytes in there, which the native serializer add for private properties, and thus would complicate saving in databases etc.
3. We should add to our symfony BC promise, that only classes that implement Serializable are ensured to be deserializable correctly with serialized representations of the class in previous symfony versions.
[Debug] DI controllable ErrorHandler::register()
bug #12329 [Routing] serialize the compiled route to speed things up (Tobion)

This PR was merged into the 2.3 branch.

Discussion
----------

[Routing] serialize the compiled route to speed things up

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | not really
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #12012, #12220
| License       | MIT
| Doc PR        | -

This also makes the CompiledRoute implement Serializable in order to:

1. make the serialization format shorter
2. have no null bytes in there, which the native serializer add for private properties, and thus would complicate saving in databases etc.
3.  Since the Route now includes the CompiledRoute in the serialization, the CompiledRoute serialization must be consistent as well. We can only ensure that in future symfony version by implementing Serializable.

We should add to our symfony BC promise, that only classes that implement Serializable are ensured to be deserializable correctly with serialized representations of the class in previous symfony versions.

Commits
-------

fd88de7 [Routing] serialize the compiled route to speed things up
[Kernel] ensure session is saved before sending response
[Session] remove invalid workaround in session regenerate

The original issue #7380 was just caused because the developer missed to save the session before doing the redirect. That's all. This reverts #8270 and following.
minor #12206 [Config] fix filelocator with empty name (Tobion)

This PR was merged into the 2.3 branch.

Discussion
----------

[Config] fix filelocator with empty name

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

fix filelocator with empty name + phpdoc in config component

Commits
-------

63b8c07 [DependencyInjection] use inheritdoc for loaders
ddd2fe2 [Config] fix filelocator with empty name
Remove aligned '=>' and '='
minor #12362 [2.5] Remove aligned '=>' and '=' (disquedur)

This PR was merged into the 2.5 branch.

Discussion
----------

[2.5] Remove aligned '=>' and '='

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | [https://github.com/symfony/symfony/issues/12284]
| License       | MIT

PR for 2.3 branch : https://github.com/symfony/symfony/pull/12293

Commits
-------

e638ccb Remove aligned '=>' and '='
[VarDumper] polymorphic and stateless output selection
[VarDumper] UML prefixes for properties
[VarDumper] use symfony.com colorscheme