This is a quick hack (not meant to be committed) to give a first impression of how a Sentinel 2 satellite background would look like for Vector OSM. Implementation wise this is a hack because it modifies the geographics items styling on the fly without any checks whether Sentinel 2 is active. A real implementation should instead modify StyleBuilder: Add the current background (solid color vs. texture tiles) to StyleParameters and then modify the styles dynamically based on that in createStyle(). I'll create a task for that.