[BUGFIX] Bad return URL in backend user group module
[BUGFIX] Removed access restrictions from backend groups
[BUGFIX] Bad edit URL for backend user groups
[FEATURE] Added file mount administration module

File mount administration module. Contains listing, paging, detail view and
filter options.
[FEATURE] Added filter to backend groups module

Allows for filtering by group title.
[TASK] Updated module icons

Updated module icons to match those used by TYPO3 by default.