Now all armors may give TU, stamina and strength bonuses

All armor rulesets may contain the following nodes
- baseTUBonus
- percentTUBonus
- baseStaminaBonus
- percentStaminaBonus
- baseStrengthBonus
- percentStrengthBonus

The formula for BonusX is baseXBonus+(percentXBonus*stats.X)/100. The bonus is then applied to stats.x.
The BonusX values are used to display unit informations (Basescape+Battlescape), at first/new turn values init, but NOT at calculating action costs, which depend only of raw stats.