[WIP] Modification of armor sort screen 

Done as an replacement for PR #7776 - I failed to resolve merge conflicts, so I started from the scratch (as usual). I'm trying to find free time for finalizing this PR.

Design is almost done but control code still should be updated. The most complex part for me is the moving of the items (all of these vectors, pointers & iterators drive me crazy; I'll keep trying, anyway).

Current view of the window:
![view](https://cloud.githubusercontent.com/assets/5421954/4067786/d3edbe80-2e31-11e4-8949-89f944ef716d.png)