Ping Catchup

See merge request !302

Call getaddrinfo less frequently when hole punching

See merge request !303

If the client has caught up to the server -- say, during a wipe -- make GetLag return a ping of zero

Should fix the momentarily large ping bug.

Don't advertise offline

See merge request KartKrew/Kart-Public!300

This appears to be a long-time bug that exists upstream too, but nobody even knew about it before the MS rules alert made it clear this was actually happening!

Don't use localaim/angle in skybox in demos

Closes #18

See merge request KartKrew/Kart-Public!299

cmake: add exchndl link on mingw32

See merge request KartKrew/Kart-Public!297

cmake: remove win32 subdirectory

See merge request KartKrew/Kart-Public!296

Make separate deadzones for x/y axis + menu options

See merge request KartKrew/Kart-Public!265

Increase maximum WAD and skin counts

See merge request !291

Time spent in I_NetRequestHolePunch no longer counts
toward ping measurement in the server list.

Thanks to Callmore's insistence on me sweeping through functions that
return -1 on error.

Don't sleep w/ fpscap 0 and vsync enabled

See merge request KartKrew/Kart-Public!294

Per @TehRealSalt's recommendation.

fix portal interp view positioning and camera reset

Closes #14 and #12

See merge request KartKrew/Kart-Public!293

Various fixes for 1.6

Closes #17, #15, and #11

See merge request KartKrew/Kart-Public!292

This time without spare slots, because I don't see shenanigans like
WAD_MUSIC happening with skin indices. Verified to work by saving a
replay with 139 skins as the 133th skin and playing it back a few times.
Shouldn't cause issues with netcode either because there are no SINT8s
handling skin indices.

Can be increased up to 255 safely, just not 256. 5 slots left for
shenanigans like Moe Mansion's WAD_MUSIC.

Update gfx.kart hash

CONS_Printf calls CON_Drawer during startup, thread
collision stuff.