various small tweaks and cleanup

src/mol-geo/geometry/geometry.ts

src/mol-geo/geometry/points/points-builder.ts

src/mol-geo/geometry/points/points.ts

src/mol-gl/renderable/util.ts

src/mol-gl/util.ts

src/mol-repr/representation.ts

src/mol-repr/volume/representation.ts

web/render-test/index.js