Fixes the file browser which was broken in Revo 2.3

This version makes use of the new 'modx-media-view' widget, allowing much simpler JS code.
Select file on ENTER
Use same button order and similar styles as the TV browser in the manager
some CSS fixes
Prevent switching of media source
Respect Tv properties (again)
Moves filebrowser related files to more standard location
Updates German translation
Some fixes/improvements to German translation
small improvements to JS code
drop support for Revo releases older than 2.20
New file structure to make sure that the filebrowser controller is found in Revo 2.2.x
Make the old filebrowser (2.2.x) look and behave like the new one
rename JS files
Some more renaming
Merge branch 'dev' into filebrowser_2.3
Fix quotes in translated Javascript
Remove more pre-2.20 code
Update docs
Markus mod for MODX 2.3; allow templateid and parent as property aliases