Fix the issue where custom exits with skipped intermission screens (notably, Black Core Zone 2 and 3) would cause the game to softlock when playing on a save file, or with a live event backup.

Restore SKINCOLOR_SUPERGOLD1-5 changes from 2.2.3

See merge request STJr/SRB2!1042

Fix custom skincolors being fullbright & signpost backgrounds using incorrect color shades

Closes #179 and #182

See merge request !1043

Whose idea was it to make the aPNG speed 1/2x by default?!

See merge request !1044

2.2.5 preparation

See merge request !1039

Remove Software tricks

See merge request !1036

Fix autoexec file trying to set netvars when joining from command-line

See merge request !1040

M_RATHON header text

See merge request !1041

Fix timeout

See merge request !1038

The credit

See merge request !1033

Knuckles tweaks

See merge request STJr/SRB2!1030

Allow macOS builds to be launched through Steam

See merge request !996

Create a slightly more dynamic, optional frame delay system to show off your terrible hardware with

See merge request !1023

Take 2: Fix Old Brak missiles + add pw_ignorelatch

See merge request STJr/SRB2!1006

Use levelflat->name instead of flatname

See merge request STJr/SRB2!1024

Make Linedef type 422 smarter

See merge request !1014

Jet Jaw Sounds

See merge request !1018

More platform fixes

See merge request !999

New Debris for CEZ3

See merge request !1012

Add SF_NOSUPERSPRITES

See merge request !1000

Rename "Legacy" control scheme

See merge request !1029