Highlight tech/civics that provide boosts on completion

**Issue by [vttale](https://github.com/vttale)**
_Monday Dec 19, 2016 at 20:20 GMT_
_Originally opened as https://github.com/CQUI-Org/cqui/issues/169_

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When you've played a lot you start to remember that learning Guilds will provide a eureka for Banking, and so on, but it'd help if this was highlighted in some way -- like a bold font and colour change for the thing that leads to a boost. For example, the eureka for Gunpowder is "Build an armory" so in Military Engineering the Armory icon could have a highlighted border.

Along those lines, if there's a city-state quest active for something like "Build a Swordsman" it'd be great if that were highlighted as well, both in the tech/civics tree and in the build screen.

Start by locating the tech/civics tree and build-screen UI entry points, then trace the boost conditions and active city-state quests they display. Done means relevant tech, civic, and build items are visibly highlighted when they provide a boost or satisfy an active quest.

Written by the indexing model from the issue text.