Big Globe Compat - Moog's Voyager Structures

• Fixed the nether structure overrider trying to place structures 2 billion block outside of the max/min Y level.

• Adjusted nether structure spawn logic to search for a surface instead of floating whereever.

• Updated to latest version of Moog's Voyager Structures.

• Adjusted generation conditions for the skylands structures

• Updated for Big Globe 5.0.0+. • Adjusted datapack icon(real important).