- Refactor significantly (now has its own func, `G_GetNextMap`)
- If gametype uses cups, iterate through cups to find the current level, then grab the next valid level
- If not, get the next valid mapheader for your gametype
- SOC `nextmap`/`marathonnext` is not just deprecated but REMOVED
- Hide the NEXTMAP_ constants again, but leave support dummied out for if we have them publically accessible again
- Also get rid of a bunch of OTHER mapheader stuff we're never gonna use
- NiGHTS Grades? NOPE
- Vanilla titlecard patches? NOPE
- Boss music fadeout/replacement? NOPE
- Select Heading? NOPE
- You've been blocked.
- Don't show maps without lumps on the level select list
- this is me being petty, but making it NOTIMEATTACK in SOC instead of TIMEATTACK so we can reconsider the maps with/without them.
- G_MapNumber now handles special NEXTMAP_ nextmapspecial_t constants that exist at the end of the available type.
- Cleanup of G_DoCompleted
- Add bounds checking to the various SOC maincfg map starts (spstage_start, etc)
- Add lump checking to titlemap behaviour
* Required an adjustment of everywhere using G_MapNumber to return the raw header number, instead of off-by-one ala gamemap.
* Fixing gamemap is a viable improvement for a future commit, but this commit is already pretty big.
* Remove SCANTHINGS, since it used G_MapNumber and didn't work with long map names OR virtres anyways.
* Support freeing new information in CLEAR LEVELS maincfg event, since I tried to use that to test cups.
* Make Patch_Free's usability match Z_Free -- passing NULL is permitted and a no-op.
Skip up to 3 frames of rendering if the time between tics
exceeds TICRATE. If rendering is a significant source of
that slowdown, skipping some frames can speed up the game
loop and improve input responsiveness.
