Properties panel module

[pinussilvestrus]

Closes #286

• Provides Properties Panel as own module
• Render Properties panel in Editor per default
• Add option to render Properties Panel individually in Playground
  • Note that we still render the properties panel inside the editor in the playground as well, as I think it does not make sense to place it in the right if the preview is not collapsible
  • Note that this (and the embedded palette) will anyway be flexible to render in any other place once we tackle Playground components are freely attachable and detachable #292 as a follow up
  • This can be configured via (cf. test case)

const playground = new Playground({
  container,
  schema,
  data,
  editor: { inlinePropertiesPanel: false }
});

Run playground

npm run start:playground

Run editor

npm run start:editor

Playground default, inline properties panel

Playground with "external" properties panel

[pinussilvestrus]

Once we have #311 integrated, we need to make keyboard undo/redo explicit.

Cf. bpmn-io/diagram-js#662 (comment)

[philippfromme]

I'm reviewing this. 👀

[philippfromme]

Works on my machine. ™️ Good job! 🍰