Allow to access additional unit data in the AI script

Make it possible to retrieve additional unit data via a unit within the AI script. This is needed for advanced unit micro functionalities.
In particular: maximum range, minimum range, damage (all types), armor (all types), special attack recharge state, action target (The unit that is the target of the present action).

   kbUnitGet<dataType>(int unitID)

Examples of similar already existing methods:   kbUnitGetCurrentHitpoints(),   kbUnitGetMaximumHitpoints(),   kbUnitGetPosition(),   kbUnitGetOwner()

Also of interest: A bool function that returns whether a unit counters another.

   kbUnitIsCounter(int unitID, int targetID)