- add support for TextGeometry in editor. currently this is linked
  only to a single font, but all of TextGeometry functionality is
  wired to the editor's sidebar UI, which I think is more than
  sufficient now
- depreciating `height` parameter in TextGeometry options for `depth`
  for consistency with ExtrudeGeometry, which refers to the thickness
  the Text will be extruded. using `height` is still supported but
  will emit a warning in the console
- also added a `scale` parameter in TextGeometry and editor. The
  numbers that work well for font sizes is unusally large in three.js
  objects (esp in VR), so passing 0.01 makes it more the conversion
  more pleasant to work with
- Serialization and deserialization works. toJSON() and fromJSON()
  is added to TextGeometry. I have to add this to Geometries.js
  for scene loading to work automatically in editor, but the dependency
  of an addon (TextGeometry is addon, ExtrudeGeometry is core) seems
  a little strange. Either there's a better way to extend the supported
  Geometries deserialization list or perhaps move TextGeometry out of
  the examples

Add `@deprecated` annotation, update warning text.

Rename `this.Geometries` to `this.geometryTypes`.