[Form] Improved FormRenderer::renderBlock() to be usable outside of form blocks
[Form] Implemented form processors
[Form] Removed trigger_error() for deprecations as of 3.0
[Form] Moved upgrade nodes to UPGRADE-3.0
[TwigBridge] Removed duplicate entries from the CHANGELOG
[PropertyAccess] Changed PropertyAccessor to continue searching when a non-public method/property are found
merged branch bschussek/issue5493 (PR #6522)

This PR was merged into the master branch.

Discussion
----------

[2.3] [Form] Implemented form processors

Bug fix: no
Feature addition: yes
Backwards compatibility break: no
Symfony2 tests pass: yes
Fixes the following tickets: partially #5493
Todo: -
License of the code: MIT
Documentation PR: symfony/symfony-docs#2092

Commits
-------

11fee06 [TwigBridge] Removed duplicate entries from the CHANGELOG
68f360c [Form] Moved upgrade nodes to UPGRADE-3.0
01b71a4 [Form] Removed trigger_error() for deprecations as of 3.0
81f8c67 [Form] Implemented form processors
0ea75db [Form] Improved FormRenderer::renderBlock() to be usable outside of form blocks
merged branch bschussek/property-access-public-check (PR #7711)

This PR was merged into the master branch.

Discussion
----------

[PropertyAccess] Changed PropertyAccessor to continue searching when a non-public method/property are found

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | yes
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | not necessary

Commits
-------

2a666cb [PropertyAccess] Changed PropertyAccessor to continue searching when a non-public method/property are found