Radar control message support for radar devices

[TomasTwardzik]

Motivation

We need to add a first class citizen support for maritime radar sensor in MAVLink to enable to visualize and control radar devices from GCS. This message set should be reasonably generic to allow for that.

What's new

Commands

• MAV_CMD_RADAR_SET_STATE
• MAV_CMD_RADAR_SET_GAIN
• MAV_CMD_RADAR_SET_RANGE
• MAV_CMD_RADAR_SET_MODE
• MAV_CMD_RADAR_SET_SEA_CLUTTER
• MAV_CMD_RADAR_SET_RAIN_CLUTTER
• MAV_CMD_RADAR_SET_SEA_STATE
• MAV_CMD_RADAR_SET_NOISE_REJECTION
• MAV_CMD_RADAR_SET_TARGET_EXPANSION
• MAV_CMD_RADAR_SET_INTERFERENCE_REJECTION
• MAV_CMD_RADAR_SET_TARGET_SEPARATION
• MAV_CMD_RADAR_SET_SCAN_SPEED
• MAV_CMD_RADAR_SET_DOPPLER_MODE
• MAV_CMD_RADAR_SET_SPEED_THRESHOLD
• MAV_CMD_RADAR_SET_SIDE_LOBE_SUPPRESSION
• MAV_CMD_RADAR_LIGHT

Messages

• RADAR_SYSTEM_STATUS - overall aggregate state of a radar device to allow UI elements to display it's state.

Enums

New pertaining enums to execute commands/report telemetry

Discussion points

• Range enum might differ among vendors
• high repetition in enum definition, for now chosen to enable decoupling of concepts moving forward