Shows touch area extents when turned on

- Fix imports to support 5.7
- Move properties to correct location

Some android versions leave a focus arrow indicator turd in the
control. This gets rid of it.

Previous mechanism was exposing possible bug in Qt which would prevent
clicks from work on ToolStrip buttons after cancel MouseArea was hidden.

Also correctly set implicitHeight on QGCTextField

Convert bool settings to SettingsFact

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