wip selection model

src/mol-canvas3d/canvas3d.ts

...l/structure/model/properties/utils/secondary-structure.ts

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

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

src/mol-plugin/behavior/dynamic/camera.ts

src/mol-plugin/behavior/dynamic/representation.ts

src/mol-plugin/behavior/static/misc.ts

src/mol-plugin/behavior/static/state.ts

src/mol-plugin/command.ts

src/mol-plugin/context.ts

src/mol-plugin/ui/controls.tsx

src/mol-plugin/ui/viewport.tsx

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

src/mol-plugin/util/loci-label-manager.ts

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

src/mol-repr/representation.ts

src/mol-util/bit-flags.ts

src/mol-util/input/input-observer.ts