Too much shit to explain, read the diff (you should anyway!)
Very sloppy, expect lots of fixes
TODO: SOC it all, separate "active odds" table, how to handle alt items
- 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.
Allows for custom weather types.
In SOC:
```Freeslot
PRECIP_GROOVY
Weather PRECIP_GROOVY
Type = MT_PARTICLE
Effects = PRECIPFX_THUNDER|PRECIPFX_LIGHTNING```
In Lua:
```freeslot("PRECIP_GROOVY")
precipprops[PRECIP_GROOVY] = {
type = MT_PARTICLE,
effects = PRECIPFX_THUNDER|PRECIPFX_LIGHTNING
}```
Then in level header, simply set `Weather = PRECIP_GROOVY`.
Other properties are part of the object itself:
- Falling speed is set as the object's speed
- Sound ID is set via the object's SeeSound
- Sound frequency is set by the object's Mass.
* Rework HU_UpdatePatch to HU_UpdateOrBlankPatch with a "required" boolean.
* If desired graphic is not present in resources:
* If required is true, return `missingpat`.
* If false, return NULL as before (font compatibility).
* Add an alias with the previous function signature, so you don't need to add a million `true`s everywhere.
* Remove a ton of irrelevant graphics the game attempts to cache only because of code inherited from vanilla SRB2.
* Remove the unused hudinfo system, also inherited from vanilla SRB2.
