An edge detecting Android app

todos in this branch.
Migrate majority of logic out of EdgeView and into an
interface EdgeConverter {
   public Bitmap convertFrame(byte[] yuv, int height, int width);
}

And EdgeView becomes
class EdgeView extends etc 
{
    //implement onDraw
    //implement onTouch
    //implement Camera.PictureCallback
    //implement setEdgeConverter
    
    onPreviewFrame{
        if (cameraLock.trylock()){
	    bitmap = edgeConverter.convertFrame
	}
    }
}


Then there can be
class NativeConverter       implements EdgeConverter
class FilterScriptConverter implements EdgeConverter