Tobias Bosch ba9fecd068 refactor(render): use RenderElementRef in all renderer methods
BREAKING CHANGES:
- Almost all methods in `Renderer` now take a `RenderElementRef` instead
  of a `ViewRef` + `boundElementIndex`.
- These methods can be called with the `ElementRef` from the app side
  directly.

Closes #2706
Related to #2476
2015-06-23 14:26:34 -07:00
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