Update Notes For 13 Feb

- Limiting the number of technology levels of castle to three
- New mechanics for capturing cities
- Changes in the way damage is calculated
- Displaying the damage type of each unit
- Ability to place peasants in the mine and sawmill to increase gold production
- Ability to hire mercenaries in the tavern in the castle
- Updated statistics of all units in the game
- New unit skills
- 16 new skills describing unit characteristics