Fix broken GT_ constants with custom gametypes

See merge request !769

Update credits again

See merge request !760

Fix game hanging on server creation/splitscreen if your name is whack

See merge request STJr/SRB2!752

Starpost config additions

See merge request STJr/SRB2!680

Fix fuckup 2

See merge request STJr/SRB2!744

Fix memory leak when caching rotsprite

See merge request STJr/SRB2!745

Make flying TNTs' explosions not so laggy the first time

See merge request STJr/SRB2!746

Reset pmomz after applying it to momz

See merge request STJr/SRB2!747

Remove flight cutoff property

See merge request STJr/SRB2!748

Don't I_Error if non base files fail to load with -file

See merge request STJr/SRB2!678

Fix splitscreen player being unable to move

See merge request STJr/SRB2!749

Automap fixes

See merge request STJr/SRB2!735

Fix color LUT using the wrong palette

See merge request STJr/SRB2!739

This is the where the extreme lag when TNT Barrels explode came from. Probably
because the sprites are big and there's four of 'em! It shouldn't matter that
these aren't rotated--they're pretty round.

Don't draw yourself in first person!

See merge request STJr/SRB2!697

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

See merge request STJr/SRB2!714

Fix damagetype for Cybrak flamethrower.

See merge request STJr/SRB2!731

Fix the minecart angle thing in netgames

Closes #69

See merge request STJr/SRB2!732

Fix title card not showing up at all if focus lost

See merge request STJr/SRB2!736

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 !743