linenum could go out of bounds if you use more than 4 linedefs for such setup, hence making the game unable to retrieve textures and therefore crashing the games sometimes

many thanks to indev for helping me figuring this one out c:

Fix physics quirkiness on slopes with convex sectors

See merge request !2250

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

Closes #1173

See merge request !2263

Optimize polygon sorting on batch renderer

See merge request !2253

Fix bans by remote admins corrupting banlist

See merge request !2266

Update & save unlockables when visiting a new map

Closes #1122

See merge request !2279

Fix 3D floor texture skewing

See merge request !2281

General NiGHTS Fixes

See merge request !2199

Fix segfault when setting up view frame for a removed mobj

See merge request !2270

Resolves #1122

Fix #1177

Closes #1177

See merge request !2268

Fixes for !2190

See merge request !2273

Add v.getSectorColormap and P_GetSectorLightLevelAt

See merge request !2230

Improve addon download refusal messages

See merge request !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 !2196

ZDoom translations

See merge request !2190

Fix IPv6 bans incorrectly banning IPv4 address

See merge request !2265

Co-authored-by: Zwip-Zwap Zapony <zwipzwapzapony@gmail.com>

This reverts commit fc1e8fb5.

Draw Character in NiGHTS Attack

See merge request !2175