Updated the libSession build script to reset and checkout submodules based on a flag (simplify the process)
Updated the share and notification extensions to generate the DSYM on debug builds to allow for better debugging
Added additional startup logging for debugging purposes
Tweaked the SNLog function to indicate when the log happens on the main thread (slightly less efficient but should help track down logic incorrectly running on the main thread)
Fixed a bug where we weren't recording the last PN server registration (so would re-register every time)
Fixed a bug where if the user sent the app to the background too quickly after launching the app wouldn't successfully startup when re-opening
Fixed a bug where the Notification and Share extensions would assert because they were dispatching the post-migration logic to the main thread (due to the threading changes in a previous release)
Fixed a bug where the Notification extension would incorrectly poll open groups on the main thread
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