color-/size-data related refactoring

src/mol-geo/representation/structure/visual/util/common.ts

src/mol-geo/util/color-data.ts

src/mol-view/theme/color.ts

src/mol-view/theme/color/custom.ts

src/mol-view/theme/size.ts

src/mol-view/theme/size/physical.ts

src/mol-view/theme/size/uniform.ts