Union Fixes

[h3]Union Fixes[/h3]

• When creating a union with a special alliance like the HRE, the civilization will now be added to the alliance if it wasn't already a member.
  
• If a union is created with the Emperor or the alliance leader, the player will become the new Emperor.
  
• Manpower, regiment limit, and income bonuses are now correctly awarded after becoming Emperor.
  
• Unions are disabled when playing in Age of Chaos mode.
  
• Minor bug fixes