Dim governments which have already been tried

**Issue by [Sesostrismage](https://github.com/Sesostrismage)**
_Friday Dec 23, 2016 at 16:12 GMT_
_Originally opened as https://github.com/CQUI-Org/cqui/issues/187_

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I tend to forget which government types I've already tried, and when I want to switch, I have to click each government to see if it's been tried before. Some sort of semi-dimming of available but already-tried governments would be neat.

Start by finding the government-selection UI in the CQUI repository; no file or test is named. Done means governments that have already been tried appear semi-dimmed, while available governments remain usable.

Written by the indexing model from the issue text.