new Version 0.266

- Added historic past and future events that you can load directly: comet flybys, solar eclipses and lunar eclipses. You can load them from either the start screen or from the restart menu.
- Added the blue giants Achernar, Acrux, and Hadar, as well as the red giant Aldebaran, in their correct Milky Way locations.
- Added custom clouds (textures menu p.6). It gives some control over the shape, color and movement of the clouds.