Add international investments

[Nashet]

• [ ] To avoid lag make some cached data structure
• [x] AI countries should invest too!
• [x] remake Aristocrats investments
• [x] remake factory panel
• [x] Include modifiers in profit calculation
• [x] Include taxes in profit calculation
• [x] Consider unemployment level? That included in labor cost. Add risk of impossibility to hire people
• [x] fix exception in Ownership
• [x] Improve Nationalization
• [x] Add investments risks