Fix frame blend flags not working with 3D models

See merge request !1778

Fix papersprites being rotated incorrectly in Software when viewing them on the flipped side

See merge request STJr/SRB2!1770

Add angle field to linedef_t

See merge request !1602

Prevent Hangsters from sliding across the ceiling

Closes #787

See merge request STJr/SRB2!1766

Fix Ideya Capture sometimes stealing extra spheres

See merge request STJr/SRB2!1768

Do not reload every texture when adding a wad

See merge request STJr/SRB2!1725

Drop shadow fake floor/ceiling fix

See merge request STJr/SRB2!1638

Fix Minus & debris' reverse gravity behavior

See merge request STJr/SRB2!1764

Show overall grade emblem requirement of a multi-mare NiGHTS stage in SP pause menu

Closes #71

See merge request STJr/SRB2!1762

Remove drop shadow from badnik explosions, give drop shadows to Metal and flickies

Closes #218

See merge request STJr/SRB2!1761

Make S_IVSP and  S_THUNDERCOIN_SPARK fullbright

See merge request STJr/SRB2!1755

Make P_SpawnGhostMobj ghosts properly copy spritestuff2 (!1257) variables

See merge request STJr/SRB2!1741

Level platter name improvements

See merge request STJr/SRB2!1730

Also clean up redundant "startingspheres" variable

Fix typo in linux-only compilation flag

See merge request !1759

Remove MODID check from hooklib to fix compile issue (resolves #809)

See merge request !1758

Fixes #71

- Added A_SetShadowScale
- Added A_ShadowScream which combines the above with A_Scream, used for 
badnik explosions
- Gave flickies drop shadows

Update Nightopians & other state changes

See merge request !1744

Tutorial scenery

See merge request STJr/SRB2!1722

Fix #805

Closes #805

See merge request STJr/SRB2!1757

Spawn MT_RAY when attempting to spawn MT_NULL

Closes #801 and #800

See merge request STJr/SRB2!1751

2022

See merge request STJr/SRB2!1754

Fix warning when compiling with NONET=1

See merge request STJr/SRB2!1753