mol-plugin: more UI tweaks

src/apps/viewer/extensions/jolecule.ts

src/mol-plugin/index.ts

src/mol-plugin/skin/base/components/temp.scss

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

src/mol-plugin/state/animation/built-in.ts

src/mol-plugin/ui/controls.tsx

src/mol-plugin/ui/plugin.tsx

src/mol-plugin/ui/state/actions.tsx

src/mol-plugin/ui/state/apply-action.tsx