client API: add some render API extensions for timing

Attempts to enable the following things:
- let a render API user do "proper" audio-sync video timing itself
- make it possible to not re-render repeated frames if the API user has
  better mechanisms available (e.g. waiting for a DisplayLink cycle
  instead)
- allow the user to delay or skip redraws if it makes sense

Basically this information will be needed by API users who want to be
"clever" about optimizing timing and rendering.

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