Update camera specs on creation

Battery2 work: Support in FactGroups and ArduPilot Power page

Fix action list showing empty

Use FW Landing visuals in Fly View

Survey: Rotate survey entry

Also don't save to settings

Don't go into Hold before takeoff

Save fact settings for new Transect code

Single bool to debug guided actions

Show indicator for mission terrain data

Allow DropPanel dynamic sizing

Support for multiple links to a single vehicle

Appveyor only has Qt 5.9.5

FactValueSlider: Fix crash when empty

minor typo fix

Show the link indicator in the tool bar if two or more links are connected and at least one of them is a high latency link.
Show in the link indicator if a link is inactive.

- Improve function names
- For notifications of an active link change only show the priority keyword if multiple links are connected
- Use QMap instead of QList for the HeartbeatTimers
- Style improvements
- Simplify sending the MAV_CMD_CONTROL_HIGH_LATENCY command

Add the HeartbeatTimer class to track a single heartbeat for a single link.
For every new received heartbeat an instance of the class is created.
Every instance emits a signal if it timed out or the timer is restarted.
Each vehicle then decides based on all different signals which link is the
priority link.