Revert "* Improve the entity ID system, and add priority system. We should no longer have clashes."

This reverts commit 1b97875dd6.

source/world/particle/Particle.cpp

@@ -52,11 +52,6 @@ int Particle::getParticleTexture()
 	return PT_PARTICLES;
 }
 
-bool Particle::isUnimportant()
-{
-	return true;
-}
-
 Particle* Particle::scale(float f)
 {
 	setSize(0.2f * f, 0.2f * f);