Upgraded database to version 3 - added two fields for bluetooth device class.
Device classes now persisted to database.
Bluetooth icon is now shown in live tracking list.
Moved files to keep structure consistent.
Corrected mistakes from moving files but not changing code.
Device class icon now shown in devices list.
Merge branch 'feature_bluetooth_class' into develop
Fixed issue #24 - session list empty message now shown.
Fixed issue #24 again.
Merge branch 'bugfix-issue-24' into develop