Experimental new version of the window which provides a fixed update. #1944
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There has been discussion about Arcade having its own clock class, which can be used to track time within an application. The Pyglet clock provides a lot of functionality that isn't needed in this application. This conversation then led to providing fixed updates for proper physics. This PR hopes to provide an experimental window people can test with for a proper release in a later 3.x release.
In this PR there are three objects:
A clock which is used to track time.
A timer that is a "set and forget" callback which can be given to clocks and reused.
An updated window which has both a standard update clock and a fixed update clock. It also provides a new on_fixed_update event.