refactored mesh-builder

src/apps/canvas/index.ts

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

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

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

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

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

src/mol-geo/primitive/pyramid.ts

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

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

...resentation/structure/visual/polymer-backbone-cylinder.ts

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

...o/representation/structure/visual/polymer-gap-cylinder.ts

...geo/representation/structure/visual/polymer-trace-mesh.ts

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

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

src/mol-view/stage.ts