Enabling navigator, does not do anything useful yet
Fix the direction of the override switch for the new state machine
easystar startup script: load mixer from sd-card if available
Hotfix: Improved file test
tone_alarm: add GPS warning tone
Better voltage scaling for Iris
Start digital airspeed sensors as default
Hotfix: Ensure that a minimum of 10 degrees pitch is set on takeoff
Merge with master and commit geofence framework