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.

New value editing dialogs

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.

Fix crash caused by NULL vehicle

Fix up vehicle type usage when getting firmware plugin

Add support for tuning on/off live updating

Restore QGC to its normal UI layout (buttons on toolbar)

Use new extraUnitField

Get rid of QGCView, QGCViewPanel and FactPanel. All messages and dialogs are now handled in the root window.