The default was changed to replace graphics if only known content is affected.
This also required blocking the feature for Hacx, Harmony and Action Doom 2 which have no localization yet and would fall back on Doom's texts if not blocked.
Now a localization mod can disable the graphics patches containing text entirely so that it can properly localize the text based menu variant.
If this flag gets set in MAPINFO, it will override all user settings.
* added a CVAR that sets how localizable graphics need to be dealt with.
* pass the substitution string to OkForLocalization so that proper checks can be performed.
* increased item spacing on Doom's list menus to 18 from 16 pixels, because otherwise the diacritic letters would not fit. 20 would have been more ideal but 18 was the limit without compromising its visual style
* added a second text-only main menu because here the spacing cannot be changed. Doing so would render any single-patch main menu non-functional. So here the rules are that if substitution takes place, it will swap out the entire menu class.
* fixed some issues with the summary screen's "entering" and "finished" graphics.
Two files were split:
g_level.h contained both the game data definitions and some prototypes belonging to the game logic. These were split up.
decallib.cpp contained both the data and the animation thinkers. The thinkers are now in their own file.
