promote MvidFileMetaData struct to a full class since we want the instance to be automatically garbage collected, this will be used for storing information like color tables on a per frame basis
add logic to generate overall histogram with most commonly used pixels appearing first in the sorted order
convert pixel sort into a method that can be reused, fixup 16bpp support when printing pixel values
add assert to avoid compiler warning
tricky merge to include support for frame and pixel deltas, currently pixel deltas do not help much unless pixel data is a gradient that increases across the scanline, currently disabled
reorg all deltas logic related to pixels into maxvid_deltas.m