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Offline Maps: Allow custom build settings overrides

Object ownership handled by SettingsGroup base class

Grouped logging options within General Settings

ArduPilot for configurable mavlink stream rates

Updated MAVLink to handle video stream types (auto discovery)

On desktop (Ethernet connection), the ground unit pushes UDP directly, which makes the use of an actual "Link" not possible. Instead, I've moved all of Taisync support to a "manager" owned by QGCToolbox.
Added a Taisync settings with some basics already wired and running.

ArduPilot option to not start mavlink streams

CP - If a metadata name is not found in the Json file, issue an error and exit. It would crash if let proceed.

Expose guided altitude settings. Rearrange Fly and Plan view settings.

Clarify Base Position Altitude frame of reference

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

Q_ENUMS is deprecated and should not be usued.
Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

9 digit precision for lat/lon