Hovering over policy shows current benefit

**Issue by [Sesostrismage](https://github.com/Sesostrismage)**
_Wednesday Feb 01, 2017 at 07:50 GMT_
_Originally opened as https://github.com/CQUI-Org/cqui/issues/282_

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Whenever I have to choose new policies I always agonize because I can't figure out what I'm actually gaining with a particular policy. I can never remember what my industrial district adjacency bonuses are across seven cities, or how many international trade routes I have going.

So my suggestion is that whenever you hover over a policy card (whether when choosing policies or inspecting your current government), you can see the current benefit (where applicable), e.g.:
Meritocracy: Current benefit: 7 Culture
Conscription: Current benefit: 9 Gold

The issue concerns policy cards shown while choosing policies and inspecting the current government; start by locating those UI entry points in the CQUI mod. Done means hovering a policy displays its current applicable benefit, such as culture or gold, in both contexts.

Written by the indexing model from the issue text.