Merged fixes from 6.x-dev branch. Cleaned up the code base.

#120296 by joachim, daggerhart, ZoeN, drewish and tim.plunkett: Add start and end times to schedule grid.

#198354 by drewish: Add 'today' callback to the schedule node to redirect to the current day's program listing.

[#390120] by bigkevmcd, bigkevmcd, tim.plunkett and drewish: Playlist autocomplete should also query the catalog.

#589116 by tim.plunkett: station_playlist_load() should call SELECT * so we load fields other modules schema alter into our table.