Tracker - now with images!

I added a generic image table so that I could add images to worlds or ships.  The hard part was displaying them.  I finally, after way too much trouble, got the image carousel to work. While you can't see it on the image, this is a carousel you can slide through the images.  I've made it a user control so I can plop it anywhere. Currently it is on the ship page, but I'll get around to adding it to the world viewer so you can have more than one image attached to a world.