add sprite for palette shader
use palette render
remove palette script fixup
use getopt for command line options parsing
fix some .wav files loading with 20th edition
update README
valgrind warnings
add palette fixup for bitmap backgrounds in DOS/Amiga versions
add font for DOS/Amiga versions
cleanup
add palette fixup for code screen (part 16009)
cleanup
add resource stub for BANK Win31 datafile