[Metadata][XBMC] Fix nfo data

Fixes #1412 and @Lennong MPAA section
[Metadata][XBMC] Add trailer to nfo
[Metadata][XBMC] Add images to nfo
[Metadata][XBMC] Add actors to CPS info and nfo
[Metadata][XBMC] Add fileinfo to nfo

Also fixed a int / int = int divide bug
[Metadata][XBMC] Update new actors to actor_roles
[Notifications][XBMC] Add always do a full scan option to XBMC

Fixes #2498 (at least partially)
Merge pull request #2501 from mano3m/develop_xbmc

XBMC metadata update