Added the option to ensure the generation of anomalies with racial benefits

[nicolajv]

Adds an option to make sure racial anomalies are generated for races that benefit from them. Disabled by default. If enabled:

• The Clan of Saar get an asteroid field
• The Embers of Muaat get a supernova
• The Empyrean get a nebula
• The Vuil'Raith Cabal get a gravity rift

[KeeganW]

At a rough look, this looks great. I will take a second closer look at it soon with fresh eyes.