Warp gamedata corruption fix

See merge request !802

Update copyright year

See merge request !801

Fix OpenGL "color bug"

See merge request !795

Add more strings (and respective functions) for v.drawString().

See merge request !770

New skin colors, add support for preferred opposite color to save cards, new lua features.

See merge request !787

Exitmove tweaks

See merge request STJr/SRB2!709

Fix R_CacheRotSprite not working with PNG lumps

See merge request !800

Fix seenames not working without a SeenPlayer hook

See merge request !799

Clear setrenderneeded after calling VID_CheckRenderer

See merge request !793

Add pw_justlaunched to tell modders when a player launches from a slope

See merge request !792

Allow more options for when the titlecard shows up

See merge request !765

Fix the issue !678 did, but just don't exit if the file was added twice

See merge request !753

M_Ftrim

See merge request STJr/SRB2!798

- Use '%f' instead of '%g' to avoid going scientific. Should also fix some
  compiler warnings.
- The trailing zero trimming code is now useful. It started on the terminating
  byte before and wouldn't have done anything with '%g' anyway.
- Use the absolute fractional value to avoid a sign.

Rolling

See merge request STJr/SRB2!690

"+" command line parameters make sense

See merge request STJr/SRB2!707

Trim the trailing zeros off floats for cvars

See merge request STJr/SRB2!716