Add UI Unity and Workers Capacity Bar

In the main game UI, add a capacity bar below the unity # and unity rate # that shows how much unity you have relative to your max. Similarly, and adjacent add a workers bar below the workers growth rate and # of refugees to show how much pop you have relative to housing available.

The unity and workers bars will function just like the existing 'Electricty' bar where the max capacity changes as you progress through the game. The bars don't need to be nearly as thick as the current electricity bar.

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