wip, carbohydrate visual, primitive geo refactoring

src/mol-geo/primitive/polygon.ts

src/mol-geo/primitive/polyhedron.ts

src/mol-geo/primitive/primitive.ts

src/mol-geo/primitive/prism.ts

src/mol-geo/primitive/star.ts

...presentation/structure/visual/carbohydrate-symbol-mesh.ts

.../representation/structure/visual/nucleotide-block-mesh.ts

...epresentation/structure/visual/polymer-direction-wedge.ts

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

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

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

src/mol-view/stage.ts