Renderer can now be given a DisplayInfo that contains some
important information about the current display. This will be used
for frame-pacing and dynamic-resolution.
This is most relevant on Android, where we can accurately query these
parameters. Added support for that in our samples.
This also sets the minSDK to 19 (including gltf viewer's), since this is
the version we support. We were cheating before by under-reporting our
minSdk.
* Re-organize Android Gradle files
Clean up our Gradle files, share versioning, etc. and prepare for
publication to sonatype.
* Use androix annotations for desktop
* Add samples as subprojects to root Gradle
* Fix build script
* Don't break when samples aren't compiled
* Better organize the Android Studio project
