This is "gopkg.in/veandco/go-sdl2.v0" with "github.com/veandco/..." replaced by "cinetraverse/externals/veandco/..." in import paths, so that changes of the original package on gopkg.in and/or github.com won't affect this 'local' version.

"gfx", "assets", "examples" were removed, because they are not required for cinetraverse.

See README.md for the additional steps to be made in Linux, macOS, and Windows in order to be able to build this package.
