hidpi support in monocle

[Johan Vos]

Hi,

Unless I'm missing something, there is no support for HiDPI in Monocle?
The staticScreen_getScreens() method in Monocle always calls the Screen
constructor with the scale parameter set to 1.0f.

It seems to me the scale factor can be retrieved from the NativeScreen,
where it would by default return 1.0f.
That would allow e.g. the AndroidScreen to call into the native layer and
obtain the real scale factor.

I can create an issue for this, unless I overlooked something.

- Johan