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Diaspora: Return Home (WG+CB)

For v3.11.1
This adds a new war goal and casus belli. Non-gestalt empires can declare war for the return of their primary species pops that may be living in the target's empire. This allows you to "free" those pops so that you can pursue the stars together, whether they want to or not.

A valid target must be of a different primary species (for example, a 'lost colony' origin like Commonwealth of Man cannot use this war goal on their ancestral country). After setting the war goal, you get a free claim (for the duration of the war) on every enemy system in which your primary species is the majority (except the enemy capital).

In case of victory, any enemy pops of your primary species are resettled as refugees into your empire. If eligible, the target empire is forced to set your primary species to displacement purge (with regular cooldown).

In case of status quo, only such pops that are on occupied planets are resettled.

In either case, claims are enforced as usual and no pops are moved on newly conquered planets at the end of the war.