[FEATURE] Add "Enable categories tab" option

Since TYPO3 6.0 the category API has been introduced.
Any record types in TYPO3 may have categories. This
includes content elements.

The option "Enable categories tab in backend" adds a new
"Categories" tab to content elements. The behavior is the
same like the option "Enable access tab".

Resolves: #60553
Change-Id: I16263666aa49e5572ceeaadf35f46469fd67c94a
Reviewed-on: http://review.typo3.org/31821
Reviewed-by: Davor Jambor <davor.jambor@yahoo.com>
Tested-by: Davor Jambor <davor.jambor@yahoo.com>
Reviewed-by: Armin Ruediger Vieweg <armin@v.ieweg.de>
Tested-by: Armin Ruediger Vieweg <armin@v.ieweg.de>