README: move majority to the website.
README: line split
CONTRIBUTORS: link to the website's contributing page.
mv gfxsort gfxutil

See #72
gfxutil: update package name
gfxutil: clean up significantly. Closes #72
Merge branch 'v2-dev' of https://github.com/azul3d/gfx into v2-dev
Merge branch 'v2-dev' of https://github.com/azul3d/gfx into clock