Encyclopedia extensions for Repop and Eugenics FSes

svornostrequested to merge
svornost/fc-pregmod:pregmod-master into pregmod-master

Add encyclopedia notes about how to deal with the relatively difficult Repopulationist and Eugenics FSes, which seem to generate lots of questions (see #3746, #3726 (closed), #3227 (closed), #3738, #2090 (closed), #937 (closed), etc). In the case of Eugenics, add an entire game guide.

Also fixes the "Decline and leverage" breeder proposal options.

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