Negate `(netgame || multiplayer)` condition for countdown to use `defaultvalue` instead of `value` per the specifics of the previous implementation

Still removing/changing crusty vanilla holdovers, one at a time. :shitsfree:

(I could've SWORN there were more...)

Enable patch.kart, up version number

As well as other compile errors

Fix textures in GL being wacky with the screen.

See merge request KartKrew/Kart!91

- karteliminatelast uses CV_YesNo instead of CV_OnOff
- chatbacktint defaults to on
- soniccd defaults to off

Fix capslock wonkyness

See merge request KartKrew/Kart!98

Make level white fade use timeinmap instead of leveltime

See merge request KartKrew/Kart!93

Serverinfo Fixes

Closes #33 and #31

See merge request KartKrew/Kart!92

Gamedata fixes

Closes #35

See merge request KartKrew/Kart!97

Prevent more local players than the server maxplayers limit joining

Closes #30

See merge request KartKrew/Kart!90

Fix Battle Causing the game to crash in dedicated servers

Closes #36

See merge request KartKrew/Kart!88

Fix Eggman shrink bug

Closes #38

See merge request KartKrew/Kart!89

Position Num Fix

See merge request KartKrew/Kart!94

* Save gamedata in Y_UpdateRecordReplays(), so that you never unfairly lose out on your spoils by setting modifiedgame before the game ends.
* Always save your matchesplayed/totalplaytime increase at the successful completion of a level.

Fix the first digit of all exiting players in positions 10 or worse flashing the first-place rainbow.

* Fix the website MS browser mapname output being incomplete.
* Hide hell maps on the website MS browser mapname output.
* (unrelated) tweak Command_Showmap_f's logic for a more accurate name.

This should hopefully alleviate the issue where textures overwrite the screen, or the screen overwrites the texture for now.
THIS IS NOT A FULL SOLUTION TO THE PROBLEM, but I highly doubt we'll ever be loading 4 billion textures at once, ever.

Specifically: removed K_StripOther calls from touching fakes: No, none of these things need to be stripped! Also, poke K_StripOther just in case it eventually becomes relevant to have it.

Check that the displayplayer mo exists before trying to use it for scaling on Player Arrow

We've replaced/changed out all vanilla songs, so we no longer need it.

More cinematic title demos (hide most HUD elements, show a title logo in the bottom right hand corner).

Shadowed declarations
Unsuffixed float constants
There's an unsuffixed float constant I can't fix because the define is outside of SRB2. We could have our own copy of Pi if we really wanted.

It was brought up to me in another server that character creators might want to have unique engine sounds. While I don't want to support that ourselves, as we have consistent engines for gameplay reasons, this gives people the ability to script around it if they so choose.

Plus, it's just generally useful and I'm surprised vanilla hasn't added it, even though they have the function to stop ALL sounds on an object.