shinyasync 0.1.0

First release.

reactiveAsync(), observeAsync() and reactiveValAsync(): async
counterparts of reactive(), observe() and reactiveVal() that evaluate
on mirai daemons, track reactive dependencies, cancel superseded work and
return the previous value while a new one is computed.
status_async() and cancel_async() for spinners, disabled buttons and
cancel buttons.
pool_async() starts a daemon pool shared by every session in the process,
reference-counted and shut down with the last session.
bindEvent() methods so button-triggered async reactives update outputs.
Dependency capture respects isolate(), keeps req()/validate() in the
worker when they may not run, hoists reads inside formulas, ships helper
closures with their own environments, and reports assignment to reactive
values as an error.

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