Fix the console splitting up halfway through startup.

Closes #349

See merge request STJr/SRB2!1494

Fix models interpolating to frame 0 from a same-sprite2 FF_SPR2ENDSTATE state

See merge request STJr/SRB2!1515

Enhance the multitagging functionality added by !1485

See merge request STJr/SRB2!1524

Some more intermission features for Lua

See merge request !1329

A_Custom3DRotate scale fix

See merge request STJr/SRB2!1525

Have Metal Sonic use spinheight while dashing

See merge request STJr/SRB2!1382

Flicky mapload crash fix (and other tmthing-related fixes)

Closes #81

See merge request STJr/SRB2!1522

Expose M_MapNumber to Lua

See merge request !1521

I have no idea why software does this.

See merge request STJr/SRB2!1517

Expose P_ButteredSlope to lua

See merge request !1397

No airwalking (from horizontal springs)

See merge request !1428

Remove TAG_ITER_DECLARECOUNTER

See merge request STJr/SRB2!1398

Respect mobj->color while enemies & bosses flash (resolves #531)

Closes #531

See merge request STJr/SRB2!1513

Use more readable hex constants in the Software Renderer splat and floorsprite drawers.

See merge request STJr/SRB2!1442

Make a few messages more helpful (resolves #485)

Closes #485

See merge request STJr/SRB2!1519

Rollout rock improvements

Closes #445, #221, and #532

See merge request STJr/SRB2!1401

Make Armageddon Shield instantly kill Egg Guards (Closes #225)

Closes #225

See merge request !1378

Allow sliders passage through spin gaps (resolves #576)

Closes #576

See merge request !1520

Custom title card bruh moments

See merge request STJr/SRB2!1501

Easing functions

See merge request STJr/SRB2!1467

Take slopes into account in FOF wall cutoff in HWR_ProcessSeg

Closes #192

See merge request !1361

(I added the scaling to this action somewhere between 7-9 years ago, and somehow never knew I made this mistake until now, welp.)

NPO2 slope span optimization

See merge request STJr/SRB2!1216

Save skin names in save files instead of skin numbers

See merge request STJr/SRB2!1503

[SUGOI] Level select no longer assumes that games will always be linear

See merge request STJr/SRB2!1492

[SUGOI] Make stagefailed more useful, add linedef executor to toggle, and expose to Lua

Closes #361

See merge request !1463

[SUGOI] Remove skin->availability, add SECRET_SKIN

See merge request STJr/SRB2!1474

Fix Lua versions of P_ZMovement and its clones as well as P_MovePlayer so tmthing changes don't linger afterwards

move P_MapEnd call in P_LoadLevel further down, so that the P_MapStart/End pair also encloses cached actions and the MapLoad Lua hook