fix: reverted back Z_Free() to free() because it did not fit (caused crash at demo playback) + polished a few more vars (removed useless mallocs)

Signed-off-by: Stephen L. <lrq3000@gmail.com>
fix: svdemo filenames were truncated, now they should have more length to spare

Signed-off-by: Stephen L. <lrq3000@gmail.com>
fix: fixed "FIXING ENT->S.NUMBER!!!" error, crashing demo playback with OA > 0.8.5. Now, the patch is compatible with OA 0.8.8

Signed-off-by: Stephen L. <lrq3000@gmail.com>
update: README.md

Signed-off-by: Stephen L. <lrq3000@gmail.com>