ent flag cleanup

git-svn-id: svn://svn.code.sf.net/p/sauerbraten/code@5062 07af1644-1164-4067-b897-63bf4dc9b748
(cherry picked from commit 9de62612ca26de55bd118a47c6d974aa0d00993b)

Conflicts:
	src/engine/bih.cpp
	src/engine/physics.cpp
	src/engine/renderva.cpp
	src/engine/sound.cpp
	src/engine/world.cpp
	src/fpsgame/entities.cpp