Updating how arcade dispatched 'on_draw' and 'on_update' events (#2587)

* Updating how arcade dispatched events

Based on work by Cspotcode and Einarf.

Hopefully better commented, and does not disregard the difference between draw rate and update rate.

* Clean up window_commands

* Docs + changelog etc

* Reformat

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Co-authored-by: Einar Forselv <eforselv@gmail.com>

Author: DragonMoffon