Fix NiGHTS Attack crash after render mode change

See merge request !837

Fix HWR_DrawFlippedColumnInCache ignoring chroma key TF

See merge request !826

Replace NextTexAvail with glGenTextures

See merge request !828

Fix ASTBlendPixel blending with nothing

See merge request !827

Archive sprite2 Hotfix

See merge request !845

Fix desyncs never recovering if node and player mismatch

See merge request !842

One line fix: don't assume 0 (aka SPR2_STND) is the default value for sprite2, but rather what the state sets for it

This fixes some issues with a custom character tested during netplay, which did not have SPR2_WAIT sprites and therefore fell back to SPR2_STND sprites. Unfortunately, the fact they used SPR2_STND instead meant the sprite2 was not synced at all!

Fix Special Stages crashing upon taking damage

See merge request !839

Fix G_TOLFlag returning the wrong type

See merge request !834

Fix -OGLlib

See merge request STJr/SRB2!794

Fix compiler warning

See merge request !833

Fix TYPEOFLEVEL options not having enough bits for TOL_ flags

See merge request !825

Support for Lua's I/O library

See merge request !727

Turn FollowMobj into a mobj hook

See merge request !803