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

lib/CGameInfoCallback.cpp

@@ -360,13 +360,13 @@ bool CGameInfoCallback::getHeroInfo(const CGObjectInstance * hero, InfoAboutHero
 			doBasicDisguise(info);
 
 			for(auto & elem : info.army)
-				elem.second.count = 0;
+				elem.second.setCount(0);
 		};
 
 		auto doExpertDisguise = [this,h](InfoAboutHero & info)
 		{
 			for(auto & elem : info.army)
-				elem.second.count = 0;
+				elem.second.setCount(0);
 
 			const auto factionIndex = getStartInfo()->playerInfos.at(h->tempOwner).castle;