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

These are covered by SettingsGroups now

These are now stored in json file

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

Convert bool settings to SettingsFact

* Holds all the settings for the app
* Allows core plugin to override default values