Feature/toolbar dropdowns

note: this branch includes feature/toolbar and feature/edit-toolbar;

added dropdowns to toolbar component

- [ ] test coverage
- [x] finish the code
- [x] gather feedback for my changes
- [ ] submit changes to the documentation


| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| Tests pass?   | no
| Fixed tickets | none
| Doc           | none