What all needs to be done to get Heretic working in OBLIGE?
Main three things:
(1) ensure all the game definitions (in games/heretic folder) are up-to-date. They are probably close to being usable, but will need double checking.
(2) make prefabs for Heretic. All the current ones target DOOM, and use DOOM textures, flats, things and line specials. Hence we need a basic set of prefabs which use Heretic textures (etc). This will be the most time-consuming job.
(3) make titlepic generator work for Heretic, such as the new format for TITLEPIC lump, and color ranges in the Heretic palette.