[Console] added ProgressBar (to replace the stateful ProgressHelper class)
[Console] refactored the progress bar to allow placeholder to be extensible
[Console] added more default placeholder formatters for the progress bar
[Console] added support for multiline formats in ProgressBar
[Console] added a way to add a custom message on a progress bar
[Console] added a way to globally add a progress bar format or modify a built-in one
[Console] fixed PHP comptability
changed some PHPUnit assertions to more specific ones
Merge branch '2.3' into 2.4

* 2.3:
  changed some PHPUnit assertions to more specific ones
  fixed Kernel::stripComments() normalizing new-lines
  added a BC comment
  Update FileLoader to fix issue #10339
[Console] fixed progress bar when using ANSI colors and Emojis
[Console] made formats even more flexible
[Console] fixed some initializations in the ProgressBar class
Merge branch '2.4'

* 2.4:
  [Form][2.3] Fixes empty file-inputs getting treated as extra field.
  changed some PHPUnit assertions to more specific ones
  fixed Kernel::stripComments() normalizing new-lines
  added a BC comment
  Update FileLoader to fix issue #10339
  bumped Symfony version to 2.3.12
  updated VERSION for 2.3.11
  update CONTRIBUTORS for 2.3.11
  updated CHANGELOG for 2.3.11
  Throw exception when unable to normalize embedded object
  Fixed evaluation of short circuit operators
  Follow-up to #10312: Fixed minor performance related issues in Yaml\Inline.
  [2.4][HttpKernel] Fix issue #10209 When the profiler has `only_exception` option activated and a subrequest throw an exception, the parent profile cannot be found.
[Console] deprecated TableHelper in favor of Table
[Console] added the possibility to insert a table separator anywhere in a table output
[Console] make it possible to pass a style directly to Table::setStyle()
feature #10365 [Console] deprecated TableHelper in favor of Table (fabpot)

This PR was merged into the 2.5-dev branch.

Discussion
----------

[Console] deprecated TableHelper in favor of Table

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | yes
| Tests pass?   | yes
| Fixed tickets | #9788, #9680, #9325
| License       | MIT
| Doc PR        | symfony/symfony-docs#3627

This PR makes the Table helper stateless. It also adds a way to define global styles and to change/tweak existing styles easily.

The second commit adds the possibility to add a separator anywhere in the table output.

Commits
-------

21784ce [Console] make it possible to pass a style directly to Table::setStyle()
14caaec [Console] added the possibility to insert a table separator anywhere in a table output
39c495f [Console] deprecated TableHelper in favor of Table