Add support for ScreenTools.defaultFontDescent

Fixed places where the font family was not being defined (therefore using the default system font)

Remove unused code

Fixed inverse logic in camera parameter retry count
Skip close timeout if not Windows

Android done.

- Pervasive change to automatically connect to known board types
- Lots of additional changes along with this:
- More exposure of objects/properties to Qml
- Much restructuring in LinkManager and LinkManager clients

- Pervasive change to automatically connect to known board types
- Lots of additional changes along with this:
- More exposure of objects/properties to Qml
- Much restructuring in LinkManager and LinkManager clients

- Pervasive change to automatically connect to known board types
- Lots of additional changes along with this:
- More exposure of objects/properties to Qml
- Much restructuring in LinkManager and LinkManager clients

For QWidget we will just use the Qt default font sizes. This removes
the extra QQuickWidget creation which breaks boot Qml Profiling

This allows for testing issues found on high dpi screen without needing
a high dpi screen. it does this by doubling the font sizes.

Everything is now based off of default font pixel size