VMMaker.oscog-eem.975:Fix 64-bit issues i BitBlt Drop MIDI and RE plugins.

VMMaker.oscog-eem.974:Fix 64-bit issues in the AsynchFilePlugin.
merged with latest vm branch
WARNING: I removed the maxExternalSemaphores change made by Igor... and I'm not happy with it, but looked like some changes made by Eliot for 64bits were done there. I will need to comeback to this in the future.