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.

Converted Structure Scan to use CameraCalc such that it now works with
camera specs.

Also hand carried text to speech changes from Stable to master. Plus
unit tests for that.

Need to hand carry some stuff from Stable to master in order to fix

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

Also rename QmlPageInfo to QmlComponentInfo to cover more use cases

Also plugin'ize intrument panel PageView pages

This needs Qt 5.9. Do not merge it yet.

Hide "Save Path" as it breaks the UI in General Settings.