Fixed lots of warnings.

Disabled the following (for MSVC only) that couldn't (or shouldn't) be fixed.

4003: not enough actual parameters for macro 'identifier'
4250: 'class1' : inherits 'class2::member' via dominance
4251: 'type' : class 'type1' needs to have dll-interface to be used by clients of class 'type2'
4275: non dll-interface class 'type1' used as base for dll-interface class 'type2'

AI/VCAI/Pathfinding/AINodeStorage.h

@@ -17,8 +17,6 @@
 #include "../Goals/AbstractGoal.h"
 #include "Actions/ISpecialAction.h"
 
-struct AIPathNode;
-
 struct AIPathNode : public CGPathNode
 {
 	uint32_t chainMask;

AI/VCAI/Pathfinding/Actions/BoatActions.cpp

@@ -49,7 +49,7 @@ namespace AIPathfinding
 			source->manaCost);
 #endif
 
-		return hero->mana >= source->manaCost + getManaCost(hero);
+		return hero->mana >= (si32)(source->manaCost + getManaCost(hero));
 	}
 
 	uint32_t SummonBoatAction::getManaCost(const CGHeroInstance * hero) const

AI/VCAI/Pathfinding/Actions/ISpecialAction.h

@@ -13,7 +13,7 @@
 #include "../../AIUtility.h"
 #include "../../Goals/AbstractGoal.h"
 
-class AIPathNode;
+struct AIPathNode;
 
 class ISpecialAction
 {

AI/VCAI/Pathfinding/PathfindingManager.cpp

@@ -178,7 +178,7 @@ Goals::TGoalVec PathfindingManager::findPath(
 #ifdef VCMI_TRACE_PATHFINDER
 		logAi->trace("Gather army for %s, value=%s", hero->name, std::to_string(danger));
 #endif
-		result.push_back(sptr(Goals::GatherArmy(danger * SAFE_ATTACK_CONSTANT).sethero(hero).setisAbstract(true)));
+		result.push_back(sptr(Goals::GatherArmy((int)(danger * SAFE_ATTACK_CONSTANT)).sethero(hero).setisAbstract(true)));
 	}
 
 	return result;

AI/VCAI/Pathfinding/Rules/AILayerTransitionRule.cpp

@@ -116,7 +116,7 @@ namespace AIPathfinding
 			auto boatNodeOptional = nodeStorage->getOrCreateNode(
 				node->coord,
 				node->layer,
-				node->chainMask | virtualBoat->getSpecialChain());
+				(int)(node->chainMask | virtualBoat->getSpecialChain()));
 
 			if(boatNodeOptional)
 			{