Icon of Sin spawning optionally does not telefrag player

ID[K]FA cheat now includes backpack

IDBEHOLDx cheats now toggle on/off

IDMUS cheat music remembered across savegames, game crash fixed.

Fixing IDCLEV to work (from the Linux port)

Various cheat code aliases created to make double letter typing optional (like TNTAMMO and TNTAMO)

New cheats to toggle any weapons, ammo, or keys: TNTWEAP, TNTAMMO, TNTKEY.

New TNTEM cheat to kill everything on the level