added Script namespace with helpers

src/apps/state-docs/pd-to-md.ts

src/mol-model/structure/structure/element/loci.ts

...dynamic/selection/structure-representation-interaction.ts

src/mol-plugin/state/actions/structure.ts

src/mol-plugin/state/transforms/model.ts

src/mol-plugin/ui/controls/parameters.tsx

src/mol-script/script.ts

src/mol-util/param-definition.ts