Loadgame warning if the same pwads aren't used as during saving

Number of savegame slots increased from 6 to 8

No-clipping and god mode cheats preserved across IDCLEV level changes

-nomonsters, -respawn, -fast saved and restored properly from savegames

Player no longer gets stuck falling off a thin ledge after restore

Fixed failure to save original height of plats in savegame

Arch-Vile and Revenant (tracers) savegame/loadgame crash fixed

State of random number generator saved in savegame

Monsters no longer go to sleep during restore from savegame