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

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

Word jumping

See merge request STJr/SRB2!653

Locale liberation

Closes #113

See merge request STJr/SRB2!677

Optionally use a sound for 1-Up

See merge request STJr/SRB2!668

Prefer textures on walls, not flats

See merge request STJr/SRB2!687

(cherry picked from commit 986c80fb13e7ae6900792de5b4b43327af7ca76c)

And so now you really can host from multiple IP addresses.

(cherry picked from commit e56bf12537700af7b7fcd0d3b0e8586e41edddd1)

Disable title map when entering a netgame

See merge request STJr/SRB2!683

Fix node player mixups

See merge request STJr/SRB2!684

Replace all instances of XD_KICK with a SendKick function

See merge request STJr/SRB2!682

Fix node numbers being used in place of player numbers

See merge request !681

Open the console in menus and draw backpic correctly

See merge request STJr/SRB2!665