Fix crash when spawning a BOT_2PAI on a 2D map

See merge request STJr/SRB2!2552

Fix sector portal heights

Closes #1309

See merge request STJr/SRB2!2545

Merge branch '1292-non-opaque-fof-planes-with-holed-textures-display-opaque-in-software-when-sloped' into 'next'

Make transparency in planes with "splat" rendering consistent

Closes #1292

See merge request STJr/SRB2!2550

Merge branch '1304-2-2-14-pre2-opengl-palette-rendering-does-not-reflect-changes-in-sector-s-colormap' into 'next'

Fix colormap textures not being updated for palette shaders

Closes #1304

See merge request STJr/SRB2!2546

Fix connecting to localhost on non-standard ports

See merge request STJr/SRB2!2551

Fix regression in P_SetupStateAnimation

Closes #1297

See merge request STJr/SRB2!2549

Skip unchanged value validation in CV_SetCVar if there is a can_change callback

Closes #1312

See merge request STJr/SRB2!2547

Merge branch '1317-using-the-keypad-to-type-numbers-in-the-server-address-textbox-inputs-them-twice' into 'next'

Remove keypad handling in M_HandleConnectIP

Closes #1317

See merge request STJr/SRB2!2548

Fix #1277

Closes #1277

See merge request STJr/SRB2!2509

Fix `AddonLoaded` hook

See merge request STJr/SRB2!2555

Add "AddonLoaded" Lua hook

See merge request STJr/SRB2!2405

GitLab CI: timeout apt-get update command with 2 minutes

See merge request STJr/SRB2!2553

Also, fixed a bug where OpenGL would not render a plane with regular transparency if it had the splat flag.

There is no need to have that code anymore, since keypad presses also generate ev_text events.
Additionally, made text fields in menus ignore ev_keydown events if they are keypad keys.

Fix Lavafalls crashing the game when scaled down.

See merge request STJr/SRB2!2544

Fix inconsistency in master server listing

See merge request STJr/SRB2!2539

Disinclude unused function when NOMD5

See merge request STJr/SRB2!2530

Use FF_SEMIBRIGHT for some more common objects

See merge request STJr/SRB2!2541

Disable UDMF console notice

See merge request STJr/SRB2!2542

Enable OpenGL palette rendering by default

Closes #1301

See merge request STJr/SRB2!2543