Use properties having been added to DLNAMediaInfo in PMS (closes #75):
 - Correctly update reference frame count when updating a DOVideoFileInfo
 - Added button to trigger a refresh of video files requiring a refresh in the GeneralOptionsView
 - Added DBEvents for Video insert/update/delete on DB layer
 - Subscribe to Video insert/update/delete messages to update video file information in the GeneralOptionsView
 - Updated CHANGELOG
Log videos being removed while cleaning with INFO instead of DEBUG level