Shorten meta data keys for smaller file sizes

Support for Vehicle and Firmware classes

Remove AutoLoad support

Cherry pick virtual joystick fix from Stable

Updated mavlink forwarding implementation to forward all mavlink messages received on all channels onto a single UDP port. A new mavlink forwarding UDP link is created if forwarding is enabled. The mavlink settings page now has a Fact checkbox for enabling forwarding and a fact text field for specifying the host name.

Modified support for multiple first run pages. Added first run for offline vehicle settings.

Add support for Json file string translations

Fix VTOL value

Plugin'ized follow me support

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

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

Grouped logging options within General Settings

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.

ArduPilot option to not start mavlink streams

Added support for qgcRebootRequired Fact meta data value.

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.

This setting enables/disables the LinkIndicator toolbar in which the primary link can be chosen.

Automated preflight checklist: Initial commit. Note that this requires an autopilot firmware that writes the respective health flags in the SYS_STATUS mavlink message

All settings wired and persistent
Cleanup non Airmap builds