Moved the star background of the map to a new file and extended it. Solely for cleanliness.
Added Galaxy Interface, to allow addition of new Galaxies.
Added "The Blocky Way" galaxy
IGalacticraftSubMod and IMapPlanet interfaces require a Galaxy object (the same one) to check if the planet is in the same galaxy.
Implement new methods in all required classes.
Update to Forge 6.6.1
Fix crash bug upon world join on a new world.
1 in 3 chance of playing new Galacticraft music.