Power dialer improvements

A few fixes for the Power dialer (in beta):

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  Tasks can now be marked as done automatically after a set number of call attempts, so unanswered calls don't need to be closed out manually

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  The setting to skip voicemails now works correctly, whether you want to skip them or listen to them during a session

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  You can update a contact's phone number directly from the contact panel, and the call review list will reflect the change