[2.3] Removed deprecated stuff

[wouterj]

A lot of things that were deprecated in Symfony2.1 or 2.2 will be removed in 2.3. We should remove/edit the articles to be up to date.

To get a list of up to date information about what needs to be removed, see this PR: symfony/symfony#7227 This is the Pr were all removed stuff will be done.

[wouterj]

Summary

A quick summary about what is already done, based on the symfony/symfony PR:

• symfony/symfony@bfb0b83 (done in [Reference] [UserPassword] Use the non-deprecated class for Symfony 2.2 #2297)
• symfony/symfony@ecd83c6 (never documented)
• symfony/symfony@ead5317 (never documented)
• symfony/symfony@1278f16 (done in removed deprecated features #2344)
• symfony/symfony@7c55cbb (never documented)
• symfony/symfony@af4444c (done in removed deprecated features #2344)
• symfony/symfony@8344261 (done in removed deprecated features #2344)
• symfony/symfony@8ae9c92 (done in removed deprecated features #2344)
• symfony/symfony@5ae860a (done in removed deprecated features #2344)
• symfony/symfony@1ab46ae (done in removed deprecated features #2344)
• symfony/symfony@4663acd (never documented)
• symfony/symfony@ffaefe5 (done in removed deprecated features #2344)
• symfony/symfony@ecf252b (done in removed deprecated features #2344)
• symfony/symfony@d7afad2 (everything were already converted to the render function)

[stof]

the second checkbox should be checked as the doc does not describe the setup of the QtLoader AFAIK.

[wouterj]

@stof, you were fast! 🏃 I'm updating the list right now to see what needs to be done.

[fabpot]

Everything should be ok now.

[wouterj]

👍 I leave this open until the pr is merged.

[fabpot]

PR has been merged now.

[wouterj]

sorry, I meaned the doc PR

[weaverryan]

Closing this now - looks like we have the list covered