[BUGFIX] Wrong default pageModuleFieldsNews value for categories

The default settings for pageModuleFieldsNews uses category
instead of categories.

Change-Id: Ibb30f950e2f58a4e5709302106082394c1adf66a
Reviewed-on: https://review.typo3.org/29971
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer
[CLEANUP] Make proper use of TCA for FAL persistence

Add foreign_match_fields to TCA and remove obsolete
MediaFileReference model.

Change-Id: I74b98840f1f39f3a4e0817e3a517cb45ac33c493
Reviewed-on: https://review.typo3.org/29951
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer