ASA Option to run task when ready/available?

[fast-slow-still]

Currently, trying to run a task when the SpacePinBinder/PubisherASA system is not ready or is busy will simply return, with an indication of failure.

It seems that a lot of applications might rather have the awaitable task wait until it can be processed, run, then return.

One implementation of this might be to make AcquireBusy awaitable. If the publisher has the WaitUntilReady property set to false, then get current behavior: If busy or not ready, immediate return false.

But if WaitUntilReady==true, then add self to waitQueue, spin until turn comes up, then return true.

So only code that changes is inside AcquireBusy (and ReleaseBusy).