Make Extra Time powerup work in old-style special stages

See merge request STJr/SRB2!2292

Support LF_MIXNIGHTSCOUNTDOWN for old-style special stages

See merge request STJr/SRB2!2291

Fix softlock on old special stages when running out of time due to being hit

See merge request STJr/SRB2!2398

Fix #1219

Closes #1219

See merge request STJr/SRB2!2391

Add sector flags to disable equation slope physics

See merge request STJr/SRB2!2028

Issue #1195 - Standing at a corner under steam, but far away enough to not be...

See merge request STJr/SRB2!2318

Fix Issue #1150 plus some small refactoring

See merge request STJr/SRB2!2357

NiGHTS text improvements

Closes #1121

See merge request STJr/SRB2!2165

Allow per-mare time limits in NiGHTS

See merge request STJr/SRB2!2137

Add "continue" and "playersetup" Lua HUD hooks & draw followitems in the Player Setup menu

See merge request STJr/SRB2!2227

Fix Fang's death sequence

See merge request STJr/SRB2!2388

Refactor string drawing functions

See merge request STJr/SRB2!1726

Used for V_MONOSPACE and V_OLDSPACING instead of spacewidth*2

Fixes Issue #1211 - cut the amplitude on OpenGL water wave effect

See merge request STJr/SRB2!2381

Show extra Force Shield hits using text instead of stacking more icons

See merge request STJr/SRB2!2378

Fixes Issue #1040

See merge request STJr/SRB2!2377

Fix players getting kicked by auto-kick during cutscenes

See merge request STJr/SRB2!2384

Add 'sprite2' field to states

See merge request STJr/SRB2!2211

# Conflicts:
#   src/doomstat.h

Fix missing HUD item for Lua

See merge request STJr/SRB2!2383

Make the display of palette index 255 consistent between renderers

Closes #405

See merge request STJr/SRB2!2351

Fix various issues related to texture scaling

See merge request STJr/SRB2!2329

Fix #1188

Closes #1188

See merge request STJr/SRB2!2354

Substitute MT_NULL with MT_RAY in Lua

See merge request STJr/SRB2!2302