Fix crash when using -skipintro and the renderer is set to OpenGL from config

See merge request STJr/SRB2!714

Fix the minecart angle thing in netgames

Closes #69

See merge request STJr/SRB2!732

Fix M_DrawNightsAttackMountains integer overflow

See merge request STJr/SRB2!737

Fix F_StartContinue fading out incorrectly in OpenGL

See merge request STJr/SRB2!738

Fix memory leak while chat is on screen

See merge request STJr/SRB2!743

Put the (pull request repo owner) branch and commit in Appveyor EXE names

See merge request STJr/SRB2!725

Fix garbage fade on Sonic's ass in OpenGL

See merge request STJr/SRB2!715

Don't set controls to keys of array bounds

See merge request STJr/SRB2!723

Fix "cam2_turnmultiplier"

See merge request STJr/SRB2!711

Fix P_AddLevelFlatRuntime again

See merge request STJr/SRB2!717

Fix mouse in controls setup menu

See merge request STJr/SRB2!706

srb2win-jameds-appveyor-exename-b1d931d4.exe

srb2win-jameds:appveyor-exename-b1d931d4.exe

srb2win-master-a6d49eaa.exe

srb2win-master-a6d49eaa.exe

Shout-out to TAG's config that somehow had
`setcontrol2 "custom3" "KEY931926528"`, cuasing the game to crash only in
Splitscreen.

Actually actually match the old behavior and check existing levelflats in P_AddLevelFlatRuntime BRUH

Fix title screen broken when leaving during resynch

Also moved the debug down in case anyone uses that.

This reverts commit ea129f70.

In splitscreen stuff, player 2's "cam2_turnmultiplier" implementation
was wrong compared to player 1's "cam_turnmultiplier"
This commit makes player 2's multiplier work just like player 1's does

Fuck NONET

See merge request STJr/SRB2!699

Larger chat

See merge request STJr/SRB2!691

Try to set a 21 character name and SIGABRT

See merge request STJr/SRB2!689

-bindaddr for mserv

See merge request STJr/SRB2!688