Policy Enforcement update

The Retire option is now completed, the player can cancel an enforcement, which can occurs a possible Cohesion penalty for the colonies.

The Confirm option is in WIP, for also apply a possible penalty, set the policy and apply it’s global modifiers to all colonies.

Also 16 SPM items (policies and memes) are now implemented, the two last are Decelerationism and Free Market, for the Economy area.
After that i’ll need to implement the over time process of the policies/memes and the basic sub-system of the custom effects, and the 0.4 release will be done.