Improve slope physics on solid middle textures

See merge request STJr/SRB2!2455

Use correct slope for solid middle textures

Closes #1093

See merge request STJr/SRB2!2454

Merge branch '712-trying-to-load-a-folder-as-an-addon-causes-a-bad-cycle-error-everytime' into 'next'

Resolve "[2.2.10 prerelease] Trying to load a folder as an addon causes a "bad cycle" error every time"

Closes #712

See merge request STJr/SRB2!2412

SPR2defaults fix

See merge request STJr/SRB2!2461

Fix spriteinfo indexing

Closes #1255

See merge request STJr/SRB2!2463

Fix #1248

Closes #1248

See merge request STJr/SRB2!2452

Fix 3D floor side texture scaling (resolves #1247)

Closes #1247

See merge request STJr/SRB2!2435

Fix FOFs with transferline flag and many linedefs randomly crashing

See merge request STJr/SRB2!2285

Prevent infinite loop in R_RenderThickSideRange

See merge request STJr/SRB2!2470

Fix 3D floor side texture scrolling (resolves #1215)

Closes #1215

See merge request STJr/SRB2!2392

Ignore flats when loading patches

See merge request STJr/SRB2!2457

Fix repeatcnt data type mistake in UDMF specification

See merge request STJr/SRB2!2458

Fix players not rendering on team scoreboards

See merge request STJr/SRB2!2460

Fix Ctrl+Backspace in the console causing a crash

See merge request STJr/SRB2!2437

Fix Linedef type 466

Closes #1246

See merge request STJr/SRB2!2453

Fix #1222

Closes #1222

See merge request STJr/SRB2!2448

Fix composite "flats as patch" name overlap crash

See merge request STJr/SRB2!2450

Fix keyboard input when certain keys overlap with dead keys

Closes #1174

See merge request STJr/SRB2!2443

This reverts commit e67e225f.

This reverts commit 3a09c475.