wip state builders

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

src/mol-plugin-state/builder/parser.ts

src/mol-plugin-state/builder/structure-model.ts

src/mol-plugin-state/builder/structure-representation.ts

src/mol-plugin-state/builder/structure/component.ts

src/mol-plugin-state/builder/structure/preset.ts

src/mol-plugin-state/builder/structure/provider.ts

src/mol-plugin-state/builder/structure/representation.ts

src/mol-plugin-state/helpers/root-structure.ts

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

src/mol-plugin/context.ts

src/mol-state/object.ts

src/mol-util/param-definition.ts