DisposableGroup 
    A Disposable that can dispose multiple Disposable and Job instances at once.
On dispose this destroys all Disposable and Job instances attached to it.
Inheritors
Functions
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                  Add a Disposable to this group.
Add a Job to this group.
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                  Disposes the Disposable when CoroutineLauncher completes (including cancellation).
Disposes the Disposable when CoroutineContext completes (including cancellation).
Disposes the Disposable when CoroutineScope completes (including cancellation).
Disposes the Disposable when Job completes (including cancellation).
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                  Remove a Disposable from this group.
Remove a Job from this group.