Updated the SessionApp.presentConversation function from using the DBWrite thread if it didn't need to
Updated the PagedDatabaseObserver to process database commits async on a serial queue to avoid holding up the DBWrite thread
Moved another Atomic mutation outside of a DBWrite closure
Refactored the PagedDatabaseObserver 'databaseDidCommit' logic to be much more straightforward
Tweaked a couple of flaky unit tests
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