Merge udmf-next into next

See merge request !1075

Fix Credits sequence from Extras being unskippable

See merge request !1091

Add missing GCC version flags to the Makefile

See merge request !1087

Stretch the fallback titlecard to the screen

See merge request !1019

Console variable to select music preference

See merge request STJr/SRB2!939

G_FindMap and G_FindMapByNameOrCode for Lua

See merge request !693

This is because a server is not started before going to the credits. I'm way
too stupid/lazy to try starting a server, so have a special case!

Fix the Master Server so it works

See merge request !856

Fix OpenGL polyobject texture distortion

See merge request !1086

Clamp light level for shaders. Fixes #194.

Closes #194

See merge request STJr/SRB2!1085

Don't discard zero alpha fog block fragments. Fixes #198.

Closes #198

See merge request STJr/SRB2!1084

Port netticbuffer from Kart

See merge request !1077

NiGHTS fullbright fixes

See merge request !1080

Fix Super Sonic exploiting CA_FLOAT abilities

See merge request STJr/SRB2!1081

Fix crash if you start recording a replay and immediately close the game

See merge request STJr/SRB2!1082

AND OR PARENTHESIS

See merge request STJr/SRB2!1083

Allow modification of built-in skincolors

See merge request STJr/SRB2!1078

Fix muspostbossname sometimes returning garbage.

Closes #197

See merge request STJr/SRB2!1076

Fix skincolor-related memory leak

See merge request !1066

Fix lib_freeslot

See merge request STJr/SRB2!1064