Huge overhaul of difficulty levels:
- All difficulties now use minions as a difficulty ramp tool
- Platinum and below introduce minions earlier in the galaxy
- Casual has a higher base economy
- Casual uses the same system template as all other difficulty levels
- Bronze has a higher base economy but gains economy over distance slower than before
- Gold moves to T2 slightly later
- Platinum now always has at least two minions in a system
- Platinum handles its economy better
- Uber is now setup as an ultimate challenge difficulty without attempt to be fair
