Rewrote parts of resetpspritevars. Support for up to 64 spawns, and allows...

Rewrote parts of resetpspritevars. Support for up to 64 spawns, and allows more players than spawns. This means the body-snatcher bug is fixed. Also, fixed some shitty logic in actors.c for moving spawn points, and fixed some shitty "x < ud.multimode" loops.