- Added GOD2 and BUDDHA2 cheats.

- Ensures that not even telefrag damage can kill the player.
- Fixed: Players with NODAMAGE could still hurt and kill themselves via
voodoo dolls.
- Added: BUDDHA and FOILBUDDHA.

- Fixed: mugshot didn't take the god2 cheat into account.
- Follow-up of the previous commit.

- Cleaned up the DoDamage and DoKill functionality.
- Added DMSS_FOILBUDDHA and KILS_FOILBUDDHA.
- added a Buddha powerup
- made CheatKey and EasyKey vector graphics configurable through MAPINFO.
- fixed: Hitscan traces crossing a two sided line right at the height of the back sector's floor or ceiling must not be considered a hit.
- Fixed: Killing a morphed monster must trigger A_BossDeath on its unmorphed self.
- fixed: CHANGELEVEL_RESETINVENTORY may not change the player's health.

APlayerPawn::GiveDefaultInventory altered the player_t's health value which was ok as long as this function was only called from G_PlayerReborn. For all other cases this initialization was wrong and G_PlayerReborn should do this itself.
- added a compatibility option for stopping sounds when the owning actor is destroyed.