Allow obtaining ring, time & grade emblems in regular gameplay

To-do:

• Actually test if the NiGHTS time/grade stuff fully works, because the mare stuff is a mess. Both seem to work in special stages, at least
• Update the player's best time/rings/grade in mainrecords/nightsrecords if an emblem is obtained this way
• Check for usedCheats instead of modifiedgame once !1749 (merged) is merged

Doesn't keep track of score emblems, because score carries over between levels, and score emblems are kinda lame anyway. Also doesn't actually record any replays or ghosts. Would be nice, but also makes this much more complicated, so I'm not gonna bother with that for now.

Sal edit: Score emblems and Coop are now supported. Score emblems use the score gained from when you last spawned, rather than global Coop score. A possible improvement would be to put this score on the intermission screen somewhere.