wip selection model

src/examples/proteopedia-wrapper/helpers.ts

src/mol-model/structure/query/queries/combinators.ts

src/mol-model/structure/query/selection.ts

src/mol-model/structure/query/utils/builders.ts

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

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

src/mol-plugin/util/canvas3d-identify.ts

src/mol-plugin/util/selection/structure-loci.ts

src/mol-util/object.ts