LinkInterface and Vehicle uses mutexes to synchronize writing bytes to the link instead of queued signals

Cache new metadata if versions are equal

App messages now use simple modal message dialogs. Vehicle messages continue to use non-modal popup.

Separate progress bar handling for initial load, write and read batching

Fix crash caused by NULL vehicle

Fix up vehicle type usage when getting firmware plugin

Fix cases of _logVehiclePrefix usage with missing componentId

Initialization of Fact prior to Qt init causes crash.

Clarify category map usage

Fix multi-component handling.

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

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

Added support for qgcRebootRequired Fact meta data value.

Used to debug cache CRC misses.

Buggy and no longer needed

* Flight modes still not implemented. Waiting on message change.
* Also includes various cauterization of UI things which should not be
available on high latency link.

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

Must memset structures before use.

Instead of hardcoded "QGroundContorl" strings