Gatt-based beacon features

Features changes:

• Support for Gatt-based beacons and interleaved frames
• Optionally allow tracking multiple beacons with the same identifiers, distinguishing with the mac address.
• Filter out invalid RSSI values of 127 for distance calculations
• Identifier class now supports conversion to/from the UUID class.
• Optionally allow using an ArmaRssiFilter for faster distance calculation convergence.

Bug Fixes:

• Restart scanning after app is killed due to memory pressure
• Protect against crashes when falling behind on scans
• Protect against null pointer exceptions in race conditions
• Protect against crash when stopping advertising with bluetooth turned off
• Stop BLE scanning after stopping ranging of the last region