BREAKING CHANGE: `Drawing` doesn't take a reference to `Instance` anymore:
* its constructor doesn't take the reference to `Instance` anymore
* calls to update the shape (`update`, `setGeojson`, `setCoordinates`, `setMaterials`)
require a call to `instance.notifyChange` afterwards
* `point2DFactory` option of `Drawing` now uses the same prototype as
`DrawTool` (text as a string)