- change SpriteDrawerArgs to draw a full sprite instead of one column at a time
- add r_noaccel cvar to allow forced software rendering of the psprites (useful for debugging and also one person on the forum actually requested this feature)
- remove FWallTmapVals and calculate texture coordinates directly from FWallCoords
- move portal clipping out of the inner sprite drawing loop
These can cause highly dangerous recursions and execute play code deep inside the renderer and since the hardware renderer does not have these, there is very little point for the software renderer to retain them.
