added SCANsat icons

This patch adds SCANsat icons to PartCatalog:

* Off
![Off][off]

* On
![On][on]

* Demonstration
![The three planets light up and shimmer.][partcatalog]

[partcatalog]: http://i.imgur.com/U6pCVGE.gif
[off]: http://i.imgur.com/khxNydZ.png
[on]: http://i.imgur.com/OFe5JIg.png

Let me know if you object.