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Alien Anbennar Idea Group Slots

A mod that adds two additional idea group slots over the course of the game while preserving balance as best I can. That means early idea groups come at the same techs so colonization and mission trees that want certain idea groups progress at basically the same pace as before. There is no change in the cost of taking ideas or how quickly national ideas are unlocked, as the former is not needed due to idea groups having the built-in tech cost reduction for each one you take and the latter too easily can worsen the experience of mission trees that require specific national ideas to be unlocked. Sweet and simple.