Initial support for global plan-wide altitude mode setting

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

Fix min/max tests

Remove altitude mode warning which was causing recursion into dialog display and view switch problems

Remove missing support for QGCView fact missing overlays

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

Add custom validator support

Add support for Json file string translations

Small visual tweaks and fixups for patterns

Cache new metadata if versions are equal

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

Use only default values when running unit tests

Don't show (Rel) all the time

Change decimal futzing to bias towards specifically set decimal places value

Warn about Above Terrain usage

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

Allow for no default value

Translate to actual component id

ArduPIlot Follow Me setup

Fix binding from external Fact changes

Create a new Target FactControls, and add a custom target for the
Qml in the folder.