fix: Improve UI (padding, corners, edit hint) (#57)

fix: Add translations for es, it, jp, nl (#51)

fix: Renamed `add` action to `toolbar`, introduced edit support (#28)

fix: renamed add to toolbar, added edit sections

feat: basic built-in editor support

feat: DMN diagram support (#23)

feat: added fr,de locales

fix: menu titles

Integrated the renderer for in-page, embedded bpmn xmls