Add sector flags to disable equation slope physics

See merge request STJr/SRB2!2028

Issue #1195 - Standing at a corner under steam, but far away enough to not be...

See merge request STJr/SRB2!2318

Fix Issue #1150 plus some small refactoring

See merge request !2357

NiGHTS text improvements

Closes #1121

See merge request !2165

Allow per-mare time limits in NiGHTS

See merge request !2137

Add "continue" and "playersetup" Lua HUD hooks & draw followitems in the Player Setup menu

See merge request !2227

Fix Fang's death sequence

See merge request STJr/SRB2!2388