Automated the generation of language resources into the application
Added all languages that come from Crowdin, even if empty.
Allow dynamic language changes

Error message indicates Qt 5.12 is required but in reality, it's 5.11. Android CI will need to be updated as it is still using 5.9.

Switch to using firmware manifest for ArduPilot flashing

Rework ArduPilot Airfame setup page

Adjust fly overlay height
Change minimum Qt version to 5.11+

Offline Maps: Allow custom build settings overrides

TODO: Improve the experience

Add QGC_DISABLE_INSTALLER_SETUP to CONFIG will override config in QGCInstaller.pri.
However, QGCInstaller.pri can be imported in the custom one. In this way
a custom build can generate it's own installer config or add pre and post steps.

ArduPilot for configurable mavlink stream rates

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.

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

FW Landing Pattern: Support for stop photo/video. Plus item unit test.

Fix xcode project and restore LaunchImage
Cleanup unused icons

Fix xcode project and restore LaunchImage
Cleanup unused icons

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

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.