Allow the asset processor to run single-threaded.#21626
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# Objective - Allow the asset processor to run single-threaded so that asset processor tests can run in single-threaded mode too! ## Solution - Make asset hot reloading use an async channel for events instead of a crossbeam channel (which requires blocking). - Have asset processing first find all the assets it wants to process, then join all those processing tasks together. - Make the asset processing listening loop await on a stream of async channels instead of "spin-polling" (spin-lock but with polling). This should make asset processing consume less CPU! ## Testing - Tested asset processing in single threaded! It works!
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