Commit 2494 : rewritten vdp2 renderer, special function codes, regular and special color calc modes, gradation calc, 
layer priority fixes, special priority, preliminary line color screen + rotation bg insert, shadow modes, rotation bg
parameter a and b coefficient switching, needs to be converted to pthreads
Commit 2404 : add a build step which was left off the recently created release-fastbuild configuration
Commit 2403 : vdp2 rewrite, priority fixes, color calculations, shadow
Commit 2396 : fixed a scaled sprite flipping bug
Commit 2395 : AND window logic, fixes missing graphics while performing a loop in nights
Commit 2392 : correct nbg1 y coordinate increment and vertical window overflow
Commit 2391 : gouraud shading and anti-aliasing fixes to correct the sgl chrome demo
Commit 2388 : fixes and cleanup for the new vdp1 renderer
Commit 2387 : rewrote vdp1 renderer to draw with arbitrary lines like the real hardware does,
added gouraud shading
Commit 2385 : add vdp1 half luminance and half transparency color calculations.  also refactor 
a lot of repetitive drawing code into a single function.
Commit 2383 : fix polygon coloring
Commit 2379 : changed polygons to use the distorted sprite algorithm
