Unit stack rebalancing rework

- CStackInstance::count is now private with accessor methods
- CStackInstance::experience renamed to totalExperience and now stores
total stack experience (multiplied by stack size) to reduce rounding
errors
- CStackInstance::totalExperience is now private with accessors methods
- stack experience is now automatically reallocated on stack management
- Removed buggy BulkSmartRebalanceStacks pack, that mostly duplicates
BulkRebalanceStacks
- Renamed BulkSmartSplitStack to BulkSplitAndRebalanceStack to drop
unclear "smart" in name
- Reworked split-and-rebalance logic to correctly reallocate stack
experience

AI/VCAI/ArmyManager.cpp

@@ -41,7 +41,7 @@ std::vector<SlotInfo> ArmyManager::getSortedSlots(const CCreatureSet * target, c
 
 			slotInfp.creature = cre;
 			slotInfp.power += i.second->getPower();
-			slotInfp.count += i.second->count;
+			slotInfp.count += i.second->getCount();
 		}
 	}