Fixed MD3 replacements clearing Z buffer.
Merge branch 'master' of github.com:janisl/jlquake
Draw MDL models as surfaces.
Draw MD2 models as surfaces.
No need to handle depth hack here.
Draw SPR models as surfaces.
Draw SP2 models as surfaces.
Draw sprite models using current modelview matrix, just make sure it has no orientation from entity in it.
No need to restore GL state here.
Added missing break statement.
Removed use of GL_REPLACE texture environment.
Use Tech3 drawing of invalid models.
Added separate render entity type for Quake 2 beams.
Draw Quake 2 beams as surfaces.