Add control to set flight duration (which ultimately sets the end_time of flight)

Handle flight start/end time
Handle start/stop traffic monitor
Only start telemetry if enabled
Added a "Now" button for the flight start time
Collect advisories only when the rules change

More clang warnings cleanup

Updates in general was only done if a POI changed. This caused changes related to something other than a change in POI to be ignore. The code now "resets" the POI when such changes occur (change of ruleset for example).
Ruleset selection is was not persistent. When reloading the list of rulesets for a given region, any previously selected ruleset would be reset to defaults.
Also fixed several new clang warnings.

It seems the icons now use dash instead of underscore. I'm simply replacing dash by underscore wholesale (to match the existing resource names) until I know better.

Disable QtQuick compiler for Debug builds

Circle Radius

Fixed issue where the "Set Circle Radius" menu entry was trying to affect the visibility of an item within a component.

Structure Scan: Add ability to set Gimbal Pitch on manual scan

Add Trimble MB-Two GPS support #2

ArduPilot: Deal with seemingly incorrect protocol support of MAV_MISSION_INVALID_SEQUENCE

FW Landing Pattern: Z order for landing click is above map items

This way you can click anywhere

Properly handle (unavailable) RX RSSI

Create CODE_OF_CONDUCT.md

FW Landing Pattern: Use setLoiterCoordinate for correct triggering of terrain query

Fix orbit radius

Remove boost dependency from airmap public interface