* initial add of toolbar to v2 editor WIP
* fix Form test knocked out by rebase
* basic image upload functionality added to toolbar
* add cypress tests for toolbar
* move image tests to previous cypress spec
* test markdown insertion from buttons in jest
* small tidy up
* remove right padding in scrollable layout, hide scrollbar
* update tests following new line changes
* add more doc comments
* tweak padding css
* create constant for image placeholder
* add image uploader change missed in staging after merge conflict resolution
