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

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

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.

Hide SMK Cup until you've unlocked the Chao Cup on EXTRAS unless you've unlocked the Chao Cup. Fits with our modus operandi of minimising Mario exposure, while still having it for the committed.

* Use CV_NOSHOWHELP as an obstacle for CV_CompleteVar (so the hidden variables don't show up and ruin our party or anything).
* Hack around the karteliminatelast thing so we don't have to hex-edit the netids, and can release with current assets (but a different executable, of course, to get the credits).
* Fix M_HandleConnectIP not saving your current position on the menu if you use it while it's empty.

Just looks silly :V

Disable DEVELOP mode

See merge request KartKrew/Kart!85

NO MORE FILE EDITING FOR V1!!

- Swap order of Silver & Gold, for menu appearances & bug fixing
- Ensure that totalplaytime and matchesplayed aren't kept when M_ClearSecrets getss called in M_EraseDataResponse
- Set sensible defaults for emblem sprite/color