Manage uploaded OpenGL textures with an internal list

Closes #411

See merge request !1391

Fix a divby0 when you have specific character stats.

See merge request STJr/SRB2!1374

Indirectly fixes the game doing whatever after freeing a patch.
This commit implements a FTextureInfo struct type, instead of it being a typedef to the GLMipmap_s struct type.

Make sliding against objects actually work (Fixes #400)

Closes #400

See merge request !1348

Make several actions actually check for a player smh (Fixes #387)

Closes #387

See merge request !1340

Replace P_AproxDistance with FixedHypot, and replace FixedHypot's algorithm with R_PointToDist2's

See merge request !1320

Fix video mode 0 not getting centered

See merge request !1344

Fix a misuse of levelflat_t.picture in OpenGL

See merge request !1327

Fix mobj unarchiving code

See merge request STJr/SRB2!1384

Allow water running in reverse gravity

See merge request !1369

Lactozilla authored 4 years ago and LJ Sonic committed 4 years ago

This reverts commit 6f9c48a3.

# Conflicts:
#	src/p_mobj.c

Add Logan to the credits

See merge request !1379

Fix CV_RegisterVar returning LUA_GetErrorMessage to Lua when CV_CALL is involved. (Resolves #403)

Closes #403

See merge request !1346

Pressing Ctrl+Backspace In An Empty Console Crashes SRB2

See merge request STJr/SRB2!1370

Fix TICCMD_RECEIVED being overridden by gamelogic

See merge request STJr/SRB2!1337

Revert plane sorting changes

See merge request STJr/SRB2!1353

Let Lua toggle the crosshair

See merge request STJr/SRB2!1360

get stryder7x in on this

This reverts merge request !1235

Return nil on skincolor invalid field access

See merge request !1351

Fix the "missing initializer" warning/error in the CVAR_INIT macro

See merge request !1350

So we don't get Luas with access to LUA_GetErrorMessage.

Lua multitagging

See merge request !1292

# Conflicts:
#	src/doomtype.h

Fix vibing slope planes

See merge request !1335

Restore the viewpoint's angle in R_DrawPlanes instead (related to #404)

See merge request !1326