fix: start loop if user calls `useRenderLoop`

[andretchen0]

Problem

useRenderLoop used to be resume()d by default. resume() starts the loop, calling the users callbacks without the user needing to call resume themselves.

Since v4 the useRenderLoop is not started by default. This results in:

• playgrounds/demos not working
• a change in the behavior of existing user code

At the same time, useRenderLoop is no longer Tres' preferred way of looping. So it shouldn't consume resources unless necessary.

Solution

On the first call to useRenderLoop, resume the loop.