Revise some of the compositor performance improvements to improve correctness.
Implement pixel blending using a variation of Jim Blinn's no-division blending algorithm.
Move transparency type simplification further up the composition code.
Remove some unnecessary fields.
Output to YUV implementation needs revision as it is actually converting from YUV (copy of source conversion code).
# OpenWF Conformance Tests run under testexecute
TESTEXECUTE, \logs\testexecute\ct_api.htm, , z:\wfctest\ct_api.script, 800
TESTEXECUTE, \logs\testexecute\ct_offscreen.htm, , z:\wfctest\ct_offscreen.script, 3000
TESTEXECUTE, \logs\testexecute\ct_onscreen.htm, , z:\wfctest\ct_onscreen.script, 3000
TESTEXECUTE, \logs\testexecute\ct_onscreenstress.htm, , z:\wfctest\ct_onscreenstress.script, 3000