CogVM source as per VMMaker.oscog-eem.3666

BitBltPlugin:
More setup cleanup to avoid setting & testing the primitiveFail flag.
Part of sneaking up on a BitBlt clipping bug.

Avoid jumps around failure returns in the common case, jumping in the failure case.

Do not trample on the primitive error code set by lockSurfaces when loadBitBltFrom:warping: fails.

Nuke old unused accessor fetchIntegerOrTruncFloat:ofObject:

Author: eliotmiranda