hexenworld: added support for old v0.12 progs support .
add hw v0.12
update version number and copyright year in README files
update copyright years of changed sources
mdataio.h, mix_paula.c, win32.c: add missing libxmp license header.
lzw.c, path.c: remove unused assert.h includes.
updated documents for 0.97.0 changes so far.
image.c: Accept type 3 (uncompressed grayscale) TGA files.