Make all the join/leave sound effects have a `singularity` of `true` so that they don't stack super loud during major net interruption or multiple splitscreen player joins.

- Colorize items, Combi-Catcher style, while the roulette is still going. Nice Chaotix reference, and tells you when the game's just lagged.
- Items blink when you first get them! They blink white when you wait out the whole roulette, red when you mash, or rainbow for enhanced items! Blinking prevents items from being stolen too, so items can't be literally stolen before you even have a chance to see what it was.
- New item roulette sound for mashing
- Fix TC_ limits in Lua

Clean-up of unused/removed sfx, replacement of the last remaining Mario sfx, and new sfx in some spots

- Replaced eggitem landing sfx
- Replaced banana landing sfx
- Replaced item tossing sfx
- Replaced item clashing sfx
- Added sfx for drift spark tier changing
- Added sfx for brake drifting
- Reverted Mario Mode sound replacement back to vanilla

TODO: fix comment alignment

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

 - Volume of your own engine is lower than default
 - Engine sounds get quieter with more people around, ala SMK. 16 player servers should hopefully not be loud as fuck :V
 - Starting countdown and drop dash revs up your engine now
 - Doubled sound distance

9 unique engine classes with 13 sounds each, which smoothly change. Each character sounds distinct now!

Okay, seems like reducing it to 1x is enough - making it singular is overkill and means that often if the furthest one away from you is the one to yell, you'll barely hear it. At least this way you'll only hear overkill chao if you're super close to the stands and the mapper's placed way too many

	* Replaces the CZ64-era hopping Mario guys.
	* ~50% randomised colours!
	* 1/9 are FANS!
		* On mapload, some Chao select a random player in the server (even spectators) as their idol.
		* The fans cheer for their idol when they cross the finish line in a winning position!
		* They also sob when their idol loses.
	* The remaining percentage are the canon Aqua.
* Minor on-field spikeball/fake radius alterations requested by Oni.

New respawn boost behavior, where you just hold for long enough instead of timing it with hitting the ground. Also much weaker, just gives you enough boost to get going instead of being a free sneaker.

Start boosts have been severely changed. The perfect one has an extra tic on its timing window and gets Sneaker boosting special effects, but every other possible boost has been severely nerfed.

- Win/lose quotes are only played for your player
- Win, lose, and gloat lines are played from farther away

* Shield Drop...
	* Whatever you've got orbiting or trailing you, DROP THEM WHERE THEY STAND. (Except for the ghost sink. That one's OK.)
	* Pops your Thunder Shield.
	* Happens upon ANY hit, except for deathpits.
* HUD Drop...
	* Also does the above, except for the Thunder Shield thing.
	* If there's any item left in your item box, pop it out as a little hovering, rotating Minecraft item!
	* You can pick up the Minecraft item by driving over it if your item box is sufficiently empty, or the item which is contained within it is of the same type.
	* Happens upon Size Down and battle elimination.
	* Can also be forced on with `cv_kartdebughuddrop on`!
* Some other random stuff.
	* Fix a bunch of `a->scale = b`'s into `P_SetScale(a, b)` form, for maximum validity.
	* Make K_CleanHnextList and K_UpdateHnextList one function, since they only differed by one continue clause (and the type of their input parameter).
	* Allow shrunken players to pick up item boxes again.
	* Fix MF_NOCLIPTHING. (Gonna pass this fix to vanilla when I get the chance, too.)
	* Break NiGHTS a little through my machinations.

- Following Oni's proposal. This means taunts are split into 2 types for offensive items and boost, 2 less hurt sounds, and there's another clip for using invincibility item (or whatever other powerful items we want to apply it to later; maybe size-down?)
- Win/lose quotes are played at full volume for the person who said it.
- A new sound effect plays when you hit someone with voices disabled.
- Reduce amount of RNG being called from the vanilla P_Play[whatever]Sound functions
- Added our skin sound constants to the dehacked list.
- Unrelated: finish line sfx plays in splitscreen

* Flashing Eggman-hit players.
* Fix typo with Rocket Shoe item bar, and make it extensible for potential future purposes since I was fiddling with it anyways.
* More complete playerarrow visuals for various items.
* Eggman fake (and debug) item get sounds.