This reverts commit 64007290.

Stupidbad-big commit, but PLEASE don't ask me to re-do this on another branch, I swear to god. I know it makes things more difficult on you, and I'm sorry for that, but I'm definitely feeling the goddamn crunch right now and I wanna take a step back from this spaghetti nightmare and clear my head.

* Do that thing where the character icons are ALWAYS 1x sized, through having two seperate lumps.
* Revamp the S_SKIN parameters to be `facerank` (rankings - equivalent of half-scale old face), `facewant` (WANTED - equivalent of old face), and `facemmap` (equivalent of old iconprefix).
* Do that thing Oni wanted where it shows two postions above and two positions below your current ranking (and you) to the left of the screen, instead of always the top 4, with some limits to avoid drawing outside of everything.
* Replace the last few shitty Mario numbers (for the left rankings) with cool, new Oni numbers.
* Change a bunch of offsets and things so the tab rankings and the intermission work nicer with 9+ players.

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

* Homogenise old chat mode detection, which includes `cv_consolechat.value`, `dedicated`, and `vid.width < 640`.
* Make the chat notification sounds work in old chat mode.

* Fix both cv_timelimit and cv_pointlimit as "hidden options" for people to play with if they know about them via the console.
* Show GAME SPEED on the tab screen.
* Fix Invincibility and Grow's music changes being broken. (I didn't test them properly when making them P_RestoreMusic calls, sorry.)
* Stop showing the First Person Kart view in spectator mode, per Sal's request.

	* Have the entire thing slide the fuck away a short while into the intermission.
	* The tab screen is modified to work off similar behaviour and presentation.
* To go with it, a revamp of how Battle's scoring is handled.
	* It's now considered "hits", and is stored in a reuse in one of the vanilla NiGHTS variables, allowing it to use exactly the same ranking mechanisms as race.
	* No more resetting of score between battle rounds.
* Minor, unrelated general code cleanup in places.
* Disable the YEEEAH in splitscreen, otherwise you'll hear it *all the time*.

Fix all compilation errors (tested using DEBUGMODE=1 and ERRORMODE=1) that remain outstanding. Notably:
	* Remove FUNCMATH from all void-returning functions, given GCC80 specifically complains about this case.
	* Extend the length of all extant buffers to the safety threshold recommended by the compiler.
	* Add void casts to WS_getaddrinfo's setting to prevent complaints about incompatible typecasts.
	* Extend the charsel, face, and superface buffer sizes and writes to include the null terminator. (I didn't really want to do this because it's not even particularily NEEDED, but there was literally zero way to get around the request that I could find with multiple online searches. I tried.)

* Lots of menu changes!
	* Little arrows next to changeable cvars!
	* Show default value for sliders!
	* Pretty pretty pretty.
	* I don't know how to describe some of these changes.
* Effectively nuke MIDI music support!
* Skiddown at the start of a race is more interesting!
* Spinning in waterslides!
* Tiny bugfix in voting, plus a little celebration...

- Record Attack replays now save best lap time
- Removed instances of NiGHTS Attack
- Removed a lot of unlockable that have no use in Kart (ultimate mode,
perfect bonus, score emblems, etc)
- Removed all methods of activating ultimate mode

Still kinda broken.

You can now move the cursor in command prompt and chat, using left/right, ctrl+left/right, home/end, and select text with shift

(no actual SLOC changes)