xbm support for bitmaps, cant get to work on main buffer so i still have
the magic one i made that one time.
added boot screen source. and cleaned one line out of spi routine
changes to pig to secure the spi pins.  it turns out I can't see anyway
to verify integrity of bootloader or secure it.  So instead we are going
to punt and dump it in epoxy to secure the bootloader, making it
impossible to use a high voltage programmer to dump the flash, or inject
an evil bootloader.