* Updated to ZDoom 4154:
- Use a temporary bitmap when when copying true color pixels of a multipatch texture, the blend   operation is not BLEND_NONE, and it doesn't just redirect straight to a direct texture.
- Fixed: The change in r3951 knew nothing about 3D floors.
- Fixed: RandomSpawner should observe the nomonsters flags when deciding what to spawn.
- Add weapon slots to key configuration menu. 

git-svn-id: http://mancubus.net/svn/hosted/gzdoom/trunk@1530 b0f79afe-0144-0410-b225-9a4edf0717df