Region twig

What does this MR do?

• Move region/group forum/events/application/wall/fairteiler subpages to twig template
• Load javascript for region page (including all submodules) via webpack
• Remove avatar sidebars in forum as to #164 (closed)
• creates a webpack-workable version of the wall module
• SIMPLIFIES application display in region page a lot, should be added back in when the tablesorter is available via webpack
• Logic for forum is mostly splitup into a service which could use some testing -_-
• Introduces PHP INTL module to handle a localized date string

How confident are you it won't break things if deployed?

It will break/change functionality a bit. I manually tested all features except application for groups and moderation for posts.

Links to related issues

Checklist

• added a test, or explain why one is not needed/possible...
• no unrelated changes
• asked someone for a code review
• joined #foodsharing-beta channel at https://slackin.yunity.org
• added an entry to CHANGELOG.md (description, merge request link, username(s))