(Also removed a bunch of instances of PF_SPINNING since we haven't used it)

By pretty much restoring the old musicdef system, I tried to work with it but couldn't, if needed that can easily be brought back later on.

There are some issues I ran into:

- Rotation is jittery (not introduced by this commit)
- 2P is wack, I don't care

Object tracking is off, but it was off before so I don't know if I actually
broke it. Minor refactoring in HWR_RenderPlayerView and HWR_RenderSkyboxView.

* Introduce SPR2_XTRA for face graphics, since the current system is prone to plenty of conflicts with modders if you're not careful.
* Fixed a bug where you'd see :nick: on the current character selection screen if you didn't have many skins loaded.
* Fixed a bug where character skins loaded in PK3s would attempt to load every single lump of the PK3, even if it wasn't in the same subfolder as the original S_SKIN, as a sprite into the player struct. Could stand to be ported to vanilla.

Requires new chars.kart, which was created using the help of the indev 2.2-based Kartmaker update which will be available shortly.

Fixes a duplicated condition which sends the player back to the title screen under advancemap next. Teeechnically does stuff for issue #91, but I'd like to take a more thorough approach later once I've got consent for a potentially radical change to this currently useless feature.

Fixed a crash I recieved while playtesting bots on Petref which was caused by an invalid subsector reference. This can only happen when the mobj was removed. I have no idea how or why this wasn't caught earlier, but I suspect we inherited this issue from upstream in the merger.

KARTKREW is 640x400 LOL

Fix the issue where skincolor and character (and inadvertedly, name changes and followers) would not be sent to the server, leading to the 0,0 Ashura bug.

Fix the weird "Eggman is not a colour" print by fixing the code that overwrote your skin and colour willy-nilly, and then disabling it (it was a mistaken element of the port).

Temporarily disable the POSITIONI sweeping for the first 16 tics of map drawer. (Looks better for if we showcase 2.2 merge footage before creating a better title card).

* Fix the title card fade's one-frame invalid memory read.
* Disable a redundant gamestate-activated wipe, which A) horribly broke Encore wipes, B) made normal map transitions take longer than they should, and C) held on the one glitchy title card wipe frame to make the game look more broken than it was.
* Fix Encore wipes being broken by the merge.
* Disable (not remove; may want to use later) the :nick: patch draw attempts from the title card drawer.
* Re-add zonettl support to the title card drawer.
* Move the title card drawer in front of the fade (Looks better for if we showcase 2.2 merge footage before creating a better title card).

Add a mechanism where in DEVELOP builds, you can use any feature that doesn't have an unlockable in the listings attached to it.

This is necessary to test fixing wipes, because Encore mode is currently completely inaccessible otherwise.

Packet drops are still broken, but at least netgames are playable now.

It was all because of one line, I hate this.

MFE_SPRUNG flag not being applied to the object sprung would cause a infinite recursion of `P_TryMove` -> `P_CheckPosition` -> `PIT_CheckThing` -> `P_DoSpring` -> etc
Also fix springs not being de-solidfied

Dunno what's up with the spring sound not playing

Merge branch 'the-scary-22-merge' of https://git.magicalgirl.moe/KartKrew/Kart into the-scary-22-merge

Merge branch 'the-scary-22-merge' of git@git.magicalgirl.moe:KartKrew/Kart.git into the-scary-22-merge

Merge branch 'the-scary-22-merge' of git@git.magicalgirl.moe:KartKrew/Kart.git into the-scary-22-merge