Add delta time to OnEnterFrame for RenderManager

Think will be something thats really needed for animation. I will add it in.

It should return a numeric value that you can multiply your animation values to normalize animation speed.

Locate RenderManager and the OnEnterFrame entry point, then read how frame callbacks are currently invoked. Determine the expected numeric delta-time behavior for animation and verify that the callback receives it consistently; the issue provides no named file or test, so repository exploration is required.

Written by the indexing model from the issue text.