More planet sizes

[Jourin]

I made a simple mod for Moons. Based on our solar system, most planets have moons of various sizes.

I put all the known moons in our solar system into various catagories. Made three differents sizes for Tiny and then used small and medium size plantets for moons. In fact in some systems the only colonizable 'planets' could be the Gas Giants moons.

For the three sizes of tiny, I used the same bit map picture, but the tiny moons could be different sizes.

Mod was posted for 1.49. I was planing on updating it once the Gold Version is released.