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Time Gated Plagues

Sets the 4 main plagues to a minimum time in-between of 75% of their respective maximum duration time.
Example:
Merturov Plague Maximum Duration = 3 years
Minimum Interval In Between Plague Per Empire = 3/100*75 = 2.25 years

Still can go on forever but once the cures have been researched and they can be cured withing a short time they wont immediately start again.

Need observe prevalence of Plagues in general now and maybe fine tune the value.