Add fuel tank status report support

* Adds support to DroneCAN FuelTankStatus messages
* Adds fuel_tank_status uORB message
* Adds FUEL_STATUS MAVLink stream
* Adds parameter to define max fuel tank capacity

msg/CMakeLists.txt

@@ -98,6 +98,7 @@ set(msg_files
 	FollowTarget.msg
 	FollowTargetEstimator.msg
 	FollowTargetStatus.msg
+	FuelTankStatus.msg
 	GeneratorStatus.msg
 	GeofenceResult.msg
 	GeofenceStatus.msg

msg/FuelTankStatus.msg

@@ -0,0 +1,17 @@
+uint64 timestamp                        # time since system start (microseconds)
+
+float32 maximum_fuel_capacity       	# maximum fuel capacity
+float32 consumed_fuel       		# consumed fuel, NaN if unavailable
+float32 fuel_consumption_rate     	# fuel consumption rate
+
+uint8 percent_remaining                 # percentage of remaining fuel
+float32 remaining_fuel      		# remaining fuel
+
+uint8 fuel_tank_id                      # identifier for the fuel tank
+
+uint32 fuel_type                        # type of fuel based on MAV_FUEL_TYPE enum
+uint8 MAV_FUEL_TYPE_UNKNOWN = 0		# fuel type not specified. Fuel levels are normalized (i.e., maximum is 1, and other levels are relative to 1).
+uint8 MAV_FUEL_TYPE_LIQUID = 1		# represents generic liquid fuels, such as gasoline or diesel. Fuel levels are measured in millilitres (ml), and flow rates in millilitres per second (ml/s).
+uint8 MAV_FUEL_TYPE_GAS = 2		# represents a gas fuel, such as hydrogen, methane, or propane. Fuel levels are in kilo-Pascal (kPa), and flow rates are in milliliters per second (ml/s).
+
+float32 temperature                     # fuel temperature in Kelvin, NaN if not measured