- Call DRPC_Init at the end of D_SRB2Main instead of in the middle
- Call Discord_RunCallbacks in D_SRB2Loop instead of G_Ticker
- Fix errorcount nums in I_Error, an old leftover from when Discord_Shutdown was not handled by I_AddExitFunction

Fix some compile flags

See merge request !213

Warn players when going over the skin limit

See merge request KartKrew/Kart-Public!214

Various compiling fixes

See merge request KartKrew/Kart-Public!212

Avoid underflows on connection screen timer (fixes hosting servers)

See merge request KartKrew/Kart-Public!211

Turns out compiling with the internal version of curl was broken on CMake the entire time 

No idea if it compiles on Mac, it does on Linux though, at least for me.

Haven't ever gotten CMake to compile SRB2, so I'm unable to really check if this works

Kill offroad line riding

See merge request KartKrew/Kart-Public!199

Fix timedemo in OpenGL mode

See merge request KartKrew/Kart-Public!209

Remove ESLOPE POLYOBJECTS POLYOBJECTS_PLANES #ifdefs (backport srb2 2.2)

See merge request KartKrew/Kart-Public!204

Fix replay recording memory leak

See merge request KartKrew/Kart-Public!208

Correct misplaced MT_ARIDTOAD listing

See merge request KartKrew/Kart-Public!206