ZENGINE: Fix memory leak
ZENGINE: Fix unsigned/signed mismatch
ZENGINE: Restart the Clock after the video finishes
ZENGINE: Delete the scaledVideoFrameBuffer after we're done with it
ZENGINE: Only allocate memory for the scaled buffer if we're actually going to scale the video
VIDEO: Disable SCI_32 plugin guard for DUCK Truemotion

ZEngine AVI videos use DUCK Truemotion
ZENGINE: Fix frame scaling for 2bpp
ZENGINE: Dispose of .zfs file streams after processing them