Do not let SF_NOJUMPSPIN characters enter sectors they could not enter if standing at full height (Closes #457)

Closes #457

See merge request !1432

Prevent a single client from blocking Lua file transfers

See merge request !1435

Our menu system sucks. That's all I have to say.

See merge request !1445

Floorsprite fixes

See merge request !1443

This fixes the texture of the floorsprite sometimes facing the wrong way, since plane rendering can change the view angle.

Fix addons with custom gamedata not loading

Closes #473

See merge request !1427

Fix unused variable warning when USE_APNG is not defined

See merge request !1343

- PF_NOJUMPDAMAGE no longer affects height at all (you're welcome katsy).
- Characters with SF_NOJUMPSPIN will only use spinheight when panim is PA_ROLL. They cannot enter gaps when jumping with spinheight, unless also spinning or gliding.
- All other characters use spinheight when panim is PA_JUMP or PA_ROLL. They can enter gaps when jumping with spinheight.

- players with SF_NOJUMPDAMAGE but *not* SF_NOJUMPSPIN now always use spinheight while jumping (i.e. even with PF_NOJUMPDAMAGE), as long as their panim is PA_JUMP or PA_ROLL
- players with SF_NOJUMPSPIN no longer use spinheight while jumping (but,)
- PA_ROLL is now an acceptable condition for using spinheight (but not for entering gaps, e.g. S3K shields will shrink the hitbox but not allow gap entry on their own)
- flying players now only use spinheight if they do not have SF_NOJUMPSPIN (you're welcome, EggpackRE)
- players with neither SF_NOJUMPSPIN nor SF_NOJUMPDAMAGE use the same conditions as in 2.2.9 prerelease, i.e. use spinheight and can enter gaps unless they have PF_NOJUMPDAMAGE

Fix sigsegv caused by bad target check in A_Custom3DRotate

See merge request !1430

Fix OpenGL V_DrawCroppedPatch (Fixes #452)

Closes #452

See merge request STJr/SRB2!1412

(Apparently Kart made this exact fix 2 years ago and it was never backported?)

Fix compile warning on Windows

See merge request !1426

More final tweaks for 2.2.9 I guess

See merge request !1417

Papersprite dropshadows no longer askance

Closes #409

See merge request !1408

Fix a few renderflags oversights in OpenGL

See merge request !1422

Fix for #422

Closes #422

See merge request !1425

Remove misplaced SetShader call in CompileShaders (Fixes #402)

Closes #402

See merge request !1423

Use double precision in R_StoreWallRange sloped seg culling calculations (Fixes #434)

Closes #434

See merge request !1424

Print a backtrace when SRB2 crashes in a Unix-like environment.

See merge request !1288

Fixes culling issues in CEZ2 skybox

Check if GME_VERSION is defined.

See merge request !1372

Fix CA_BOUNCE height when flipped (Fixes #428)

Closes #428

See merge request !1373

Disable pausing during score screens in marathon mode

See merge request !1416

Fix translation colormap cache rebuilding using the old translation enumerations (fixes #443, #449, #459)

Closes #443, #449, and #459

See merge request !1421