Performance optimization

[numpad]

Instead of depth sorting entities based on their CPosition on the CPU before rendering back-to-front we could remove the sorting and simply discard all pixels of a CBillboard which are transparent.

Pros:

• possible performance improvement over current system [0]

Cons:

• No more semi-transparency [1]

[0] : Still need to benchmark this on low and high end systems. But less work on the CPU would definetly be benefitial

[1] : Semi-transparency can be made possible again, but requires work (two systems, one for semi-transparent billboards and one for "fast" billboards) and coordination between those two