Feature: Jump/Spin axes

See merge request STJr/SRB2!389

Assign joy button defaults for 1 and 2 player

See merge request STJr/SRB2!400

Lua FOF flat names fix

See merge request STJr/SRB2!405

Fix lua_pop -> lua_remove use in G_SetCustomExitVars lua

See merge request STJr/SRB2!404

Lua: nextmapoverride & skipstats changing outside of G_ExitLevel

See merge request STJr/SRB2!396

Add DEVELOP build flag to version string

See merge request STJr/SRB2!401

Comment out stray PK3 blockmap message

See merge request STJr/SRB2!399

Use the `offsetof` function

See merge request STJr/SRB2!394

OpenGL z-fighting fix [by Azeonus]

Closes #43

See merge request STJr/SRB2!395

Feature: Save override for level header

See merge request STJr/SRB2!392

Lua: Kart textures backport (non-foolish vers)

See merge request STJr/SRB2!391

Fix remote viewpoint cameras for real this time

This is desparately needed for KIMOKAWAIII, since there's many instances I need to change nextlevel but still want to use the existing player exit stuff.

Software plane fixes

Automap fix

Digiku said they'd handle the new button defaults so \m/

Accept '+' as substitute for '\' for sprite frames (PK3)

See merge request STJr/SRB2!380

Kind of like 2.2's, but with backwards-compatability with 2.1