Labor market, removal of normalisation and general AI improvements

[ineveraskedforthis]

1. Implement foundation of labour market: factories demand labour while pops supply it. Price of labour changes similarly to the price on all other goods.
2. Removal of renormalisation of pop savings (income scaler is now set to 1)
3. Addition of simple price prediction capabilities to factories
4. Rebalance of desired types: now AI focus on building factories with huge profits first.
5. Minor rebalance of production and consumption rates
6. Significant increase of expected payouts to pops "employed" by nation to increase game difficulty a bit