overloaded the CalcDistance Function to allo

Overloaded the CalcDistance function so it can take Creatures and PCs as inputs instead of just CombatLocations. This way the function can handle Large and Huge creatures and still calculate the right distances to the nearest edges of creatures. 

So scripts in dsPCAttack and dsCreatureAttack scripts need to be updated when they check for opportunity attacks etc.

Also changed the error message for the functions GetLocalInt and GetGlobalInt so that they simply output log messages instead of creating popups when they can't find an Int. Those popups were annoying.