Fail loudly when config isn't writable

See merge request KartKrew/Kart-Public!279

Add warning and reset flow for non-default masterserver address

See merge request KartKrew/Kart-Public!277

Small logging improvements for addon loading

See merge request KartKrew/Kart-Public!272

Few small tweaks to the connection screen

See merge request KartKrew/Kart-Public!262

A few cvar default suggestions

See merge request KartKrew/Kart-Public!263

Discord joins now force menu close and title demo stop

See merge request KartKrew/Kart-Public!270

Adds back the "Loading file" message when a file is loaded
Adds individual file errors for things loaded with W_InitMultipleFiles (-file param)
Errors for a given file will now appear between "Loading file" and
the "Added file" or "not adding file" messages, making troubleshooting easier

Error checking for running out of freeslots

See merge request KartKrew/Kart-Public!267

This prevents wierdness from ahving the menu open on teh connection screen
It also prevents the connect command from erroring due to being in a demo

Uses loop variable to determine error condition
Also small change to lib_freeslot for SFX for consistent use of I_Error

Add my full name in the credits

See merge request KartKrew/Kart-Public!264

Increase timeouts by a few seconds, helps folks joining with slow disks
Beef up the vanilla downloader settings

Changed the confirmation prompt use MB if >=10MB
Changed the ovearall progress bar to use MB if >=10MB

Discord Invite Fixes + DUMPCONSISTENCY flag for makefile

See merge request KartKrew/Kart-Public!255

DRPC: Wait for join secret to be ready

See merge request KartKrew/Kart-Public!248

Replace gamma shortcut with a fullscreen toggle

See merge request KartKrew/Kart-Public!254

Fix unnecessary texture reloads on respawn in opengl

See merge request KartKrew/Kart-Public!251

Fix RA crash

See merge request KartKrew/Kart-Public!250

Fixes a crash that can happen when starting RA attempts if you press
keys/buttons that would cancel a netgame connection

If the join secret isn't ready right away, wait for the next update instead of trying to loop for it again immediately

I believe this may be the cause of the invite crash some people have noticed in master, but I'm not sure, needs tested.

Add large address aware flag

See merge request KartKrew/Kart-Public!246

This allows the final exe to use more than 2gb of RAM in a 64-bit system
which should get rid of most out of memory errors on 32-bit builds

Fix pausing then refocusing the window causing the music to stay muted

See merge request KartKrew/Kart-Public!244

If the game is paused, music will be resumed when unpause anyway.

R_FindPlane optimization

See merge request KartKrew/Kart-Public!242