spearmint: Delete game code and QVM tools

They've been split off into https://github.com/zturtleman/mint-arena
spearmint: Update build system for deleting game code and QVM tools
spearmint: Don't merge RT_POLY_LOCAL surfaces

It was causing all smoke sprites using RT_POLY_LOCAL to at the same origin,
because the verts are in local space.
Merge branch 'master' into sdl2
spearmint: Support alphaFunc GE192

It's supported by SoF2, JK2, and JA.