Split RenderCommand generation and uniform update

In most cases, we can generate the RenderCommands once and reuse them in
subsequent frames only updating the uniforms. We still have to copy the
RenderCommands as the renderer renders while we start preparing the next frame.
This is still faster than regenerating them entirely.

Regenerating the entire commands will happen only when FrameGraph or Scene
structure changes. That should rarely be happening on a per frame basis.

Next step could be to look at how to only update commands for Entity with Parameters
that have changed.

Change-Id: I202870850a46fcd3946f81bffddb7027d192f374
Reviewed-by: Paul Lemire <paul.lemire@kdab.com>

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