Add promise-based preload mechanism #3905
Merged
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Part of #2698 - implement a new promise-based preload mechanism.
Related PR which contains some relevant discussion: #3507
This PR adds a promise-based preload mechanism, along with some tests to assert that the functionality works correctly. Note that due to the tests not being isolated from each other it is hard to test the functionality where these are applied to the
p5.prototype
object, as that is only run once per page. The tests for individual preloads should cover this gap.