wip, coloring

src/apps/render-test/state.ts

src/mol-geo/color/index.ts

src/mol-geo/color/structure/element.ts

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

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

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

src/mol-gl/renderable/mesh.ts

src/mol-gl/renderable/point.ts

src/mol-gl/shader/mesh.frag

src/mol-gl/shader/mesh.vert

src/mol-math/linear-algebra/3d/mat4.ts