MBlockScroll X1.w,Y1.w,Width.w,Height.w,X2.w,Y2.w[,SourceBitmapNum.w] ; BlockCopy graphic

Performs a block-scroll within a chunky Bitmap object or using a different chunky
Bitmap as the source. Width should be a multiple of 16 and the overall operation
should be within the dimensions of the Bitmaps. X1 (source) and X2 (dest) should
be a multiple of 16 as a special block-copy (in multiples of 16) is performed.