DEVMODE visual output messed with a bit. NOT in master this time.

* DBG_PLAYER split out from DBG_DETAILED. (The difference I'm intending here is whether it's referring to stuff in the player struct, or stuff in the mobj struct.)
* Function pointer for text so both modes can show the same stuff if it's not taking over the entire screen, and only show the "INFO NOT AVAILABLE AT THIS RESOLUTION" if it's in danger of going off the bottom.