More flavour for units

[Nashet]

• [ ] Add texture to path arrow

• [ ] draw shields above the map names

• [ ] Add clicking on shields

• [ ] Tooltips for units

• [x] better FOW

• [ ] Where is defend modifier?

• [ ] Lost armies in Liberated countries?

• [ ] Instant demobilization on province lost?

• [x] Better attacking choise for Ai, avoid friendly territories?

• [x] Ai Should more aggressive against Blobs

• [ ] Shows Cold arms needs while it's not invented

• [x] Wrong message about winning battle?

• [x] better flags