Fix blockingGet during blockingGet #1017
Merged
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ScriptManager should only ever has one in-flight blockingGet. The is_blocking flag is used to assert this, as well as enforce it in evaluate(). If is_blocking is true, evaluate() exits.
This doesn't work for async scripts however, as they aren't executed via evaluate(), but rather execute directly once complete.
This PR changes the execution behavior of async scripts. They are now only executed in evaluate() (and thus won't execute when is_blocking == true). However, unlike normal/deferred scripts, async scripts continue to execute in their completion order (not their declared order).
Fixes #1016