(cherry picked from commit ef2bff6383b16385f9874e1c9c6b66c9df794f5b)

Add missing GCC version flags to the Makefile

See merge request STJr/SRB2!1087

Fix the Master Server so it works

See merge request STJr/SRB2!856

CMAKE additions: SDL Mixer X, *.debug adjustments, CPACK adjustments, CCACHE

See merge request STJr/SRB2!992

Instructions:
1. In SQL, create an account called "srb2_ms" @ "localhost" (or your hostname).
2. Grant the account full priviledges to "srb2_ms" (the database).
3. Compile, and run using the sh script provided.
That's all I'm telling you, I don't want this to become rampant.

Automate some of the version numbers nonsense

See merge request STJr/SRB2!1054

I guess GCC isn't always "GCC"

See merge request STJr/SRB2!1057

Merge branch 'i-added-the-branch-name-into-the-version-command-when-outside-of-develop-mode' into 'master'

Adds the branch name into the version command printout when outside of DEVELOP mode.

See merge request STJr/SRB2!981

Detect GCC version in Makefile

See merge request STJr/SRB2!1002

CMake support. Srb2win.rc still needs touchy, whatever.

2.2.6 preparation

See merge request STJr/SRB2!1050

Revert "Fix computation of very high pings"

See merge request STJr/SRB2!1053

This reverts commit 82dbe95e.

Fix GL y-shearing ignoring a Y-flipped transform

See merge request STJr/SRB2!1051

Marathon Run adjustments

See merge request STJr/SRB2!1048

Fix models that use sprite textures

See merge request STJr/SRB2!1049

Bruh Core Zone 2

See merge request STJr/SRB2!1047

Introduce a live event backup penalty for non MA_INGAME runs, since the change to saving time causes problems for this.

Hopefully fix the issue, which I can't recreate, of live event backups being created even if they shouldn't.

Add a small amount of extra info to the Evaluation screen for Marathon Mode, on request from multiple runners.

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.