Root loader

Added a root loader to help deep nested children to show an element in the middle of the root Window.

PX4 FW enable acro and rattitude

Complex Item: More work in Fixed Wing Landing Pattern

Add support for SettingsFact::visible

Remove deprecated methods

Paring back OS X travis to installer only

These are covered by SettingsGroups now

Put temperature readings in vehicle values widget

Add calibrate pressure button in sensors page, enabled only for ArduSub

Fix Sub safety summary descriptions

Update parameter metadata for Sub

fixed uploading of bin files

Complex Item: Fixed Wing Landing Pattern

Add FirmwarePluginFactory::supportedVehicleTypes support

Remove serial ids

Settings fixes

These are now stored in json file

Moving more settings to new SettingGroup mechanism

Plan: Change semantics for pulling altitude from mission items for new items

Add new SettingsGroup support

ArduPilot: Beta firmware drops using new format

- Look backwards from insert point
- Only pull altitude from _WAYPOINT items
- Only set altitude on _WAYPOINT items