wip, coloring

src/mol-geo/color/index.ts

src/mol-geo/color/tables.ts

src/mol-geo/representation/structure/spacefill.ts

src/mol-geo/shape/mesh-builder.ts

src/mol-geo/shape/mesh.ts

src/mol-gl/renderable/mesh.ts

src/mol-gl/shader/mesh.frag

src/mol-gl/shader/mesh.vert