Fix equation plane distortion

See merge request STJr/SRB2!2283

Update unlockables before level load executors

See merge request STJr/SRB2!2289

Another issue that seems related to #1122

Fix netgame joining

See merge request STJr/SRB2!2288

Regression introduced by !2279.

Interpolate polyobjects properly for the software renderer (resolves #950)

Closes #950

See merge request STJr/SRB2!2284

Fix physics quirkiness on slopes with convex sectors

See merge request STJr/SRB2!2250

Resolve "[NEXT] moved UPnP to it's own thread"

Closes #1173

See merge request STJr/SRB2!2263

Optimize polygon sorting on batch renderer

See merge request STJr/SRB2!2253

Fix bans by remote admins corrupting banlist

See merge request STJr/SRB2!2266

Update & save unlockables when visiting a new map

Closes #1122

See merge request STJr/SRB2!2279

Fix 3D floor texture skewing

See merge request STJr/SRB2!2281

General NiGHTS Fixes

See merge request STJr/SRB2!2199

Fix segfault when setting up view frame for a removed mobj

See merge request STJr/SRB2!2270

Resolves #1122

Fix #1177

Closes #1177

See merge request STJr/SRB2!2268

Fixes for !2190

See merge request STJr/SRB2!2273

Add v.getSectorColormap and P_GetSectorLightLevelAt

See merge request STJr/SRB2!2230

Improve addon download refusal messages

See merge request STJr/SRB2!2153

Ported skincolor cache management from the secondcolor branch
Adjusted R_GetTranslationRemap to use a similar caching scheme
Made sure that if a skincolor was updated, then related translations would be rebuilt

Delete 'translations' Lua global

Moved string conversion helpers into m_misc.c
Adapted parser to check for '"'
Check if tokenizer returned NULL

Capture '"' characters
Capture ';' tokens
Implement tracking of the current line

Add can_change for console variables

See merge request STJr/SRB2!2196

ZDoom translations

See merge request STJr/SRB2!2190