May not make it to R1, but oh well

Fix "advancemap next" going to GHZ at the end of a cup

See merge request KartKrew/Kart!44

Next-merge plus rain

See merge request KartKrew/Kart!41

Engine tune-up

See merge request KartKrew/Kart!45

Now that we figured out that the sound cut-outs were due to a race condition and not this option, I feel content putting it with these other engine tweaks.

Minor priority change to two voice lines; the "passing someone" line has the same priority as every other line, and gave it's boosted priority to the way more gameplay-important "hit 'em" line.

Sryder's request

NOW this is good enough to ship

More sensible `drawdist_precip_cons_t` maximum (slightly more conservative than Sryder's suggestion)

* Multiplied rain speed by 3, per Oni's request.
* Disable weather density - force to 1 if weather draw distance, otherwise zero
* Move the ceilingpic check into a more convenient part of the weather spawning loop.
* `drawdist_precip_cons_t` - replaces "Infinite" with "None".
* Disable the lowest normal draw distance (256), given... both kart and srb2 are basically unplayable like that.
* Disable cv_drawdist_nights entirely.

# Conflicts:
#	src/d_netcmd.c
#	src/d_netcmd.h
#	src/g_game.c
#	src/p_floor.c
#	src/p_user.c
#	src/r_data.c
#	src/r_data.h
#	src/v_video.c

Handle fix for SDL Mixer

See merge request STJr/SRB2!301

More accurate GIF delay

See merge request STJr/SRB2!276

No doubling texture heights plz

See merge request STJr/SRB2!296

MI's unimportant code cleanup

See merge request STJr/SRB2!295

I've voided this out on other sound interfaces than SDL Mixer ones because I'm both not sure whether they need it, and not sure how to make them work with it if they do.

Remove "playerdeadview" variable; it's not been used for its stated purpose for who knows how long now

Besides rankings popping up when you die just sounds weird anyway, maybe I'm just used to SRB2 not doing it I guess

Remove unused ObjectPlace_OnChange prototype (from when Objectplace was a consvar, which it is not anymore)

Also corrected what appears to be a typo in some comments above?

(it's only set to 0 in software, and only ++'d in OpenGL, what kind of sense does that make?)

Hell Attack

See merge request KartKrew/Kart!35

New engine sounds by VAda

See merge request KartKrew/Kart!38

Karmegg

See merge request KartKrew/Kart!36

(I've moved the comebacktimer set into one level up from that conditional; don't worry, I checked - there's nowhere that accesses this field while you have bumpers, it's just always set here for some dastardly reason.)