added sequence-id and secondary-structure color schemes

src/apps/canvas/component/structure-representation.tsx

...sentation/structure/visual/util/polymer/trace-iterator.ts

src/mol-model/structure/structure/carbohydrates/compute.ts

src/mol-model/structure/util.ts

src/mol-util/color/tables.ts

src/mol-view/label.ts

src/mol-view/theme/color.ts

src/mol-view/theme/color/secondary-structure.ts

src/mol-view/theme/color/sequence-id.ts