Singularity dev status

Finally got the preliminary code up and running for the bluetooth tethering quick settings button.  I originally had this set to check for changes to the system setting that the settings panel changes when enabling bluetooth tethering but that doesn't really work very well because the setting doesn't get reset to off upon reboot.  The setting only changes when you toggle bluetooth tethering from within the settings app.  So I'm working on modifying the code to detect when there's a change in the BluetoothPAN connectivity state instead and check whether tethering is ACTUALLY enabled.  So far, rough going.  Nothing but FC after FC.  I'll get it eventually, though.