fully swap over to async/await in JavaScript #1604
Merged
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also use the standard Fetch API rather than jquery ajax
This was a pretty big change, but it makes the code a lot simpler. The callbacks within callbacks within callbacks were a nightmare when trying to reason through the code. async/await lets you pretty much just read top to bottom.
I opted against throwing errors (/using Promise.reject) in favor of returning errors instead. It's prettier than having try-catches all over the place, or maybe that's just my opinion as a Gopher.
#1602