Warp gamedata corruption fix

See merge request STJr/SRB2!802

Update copyright year

See merge request STJr/SRB2!801

Fix OpenGL "color bug"

See merge request STJr/SRB2!795

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

See merge request STJr/SRB2!770

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

See merge request STJr/SRB2!787

Exitmove tweaks

See merge request STJr/SRB2!709

Fix R_CacheRotSprite not working with PNG lumps

See merge request STJr/SRB2!800

Fix seenames not working without a SeenPlayer hook

See merge request STJr/SRB2!799

Clear setrenderneeded after calling VID_CheckRenderer

See merge request STJr/SRB2!793

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

See merge request STJr/SRB2!792

Allow more options for when the titlecard shows up

See merge request STJr/SRB2!765

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

See merge request STJr/SRB2!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

Extra emblem hint display

See merge request STJr/SRB2!721

Local Color Table for GIF movie mode

See merge request STJr/SRB2!742