Unified CStack ammo, casts and counterattacks

* it is possible now to add casts and shoots OTF (f.e. with spell bonus)

Centralized stack 'ammo' loading from bonus system.
* introduced small proxy class for local bonus cache
(no need to use global cache if particular selector used on node only in one place)
* handle killing resurrected creatures
* use IBonusBearer::MaxHealth() where possible
* Fixed https://bugs.vcmi.eu/view.php?id=2486
* Possible fix for 0 HP after resurrection.
* Hack-fixed https://bugs.vcmi.eu/view.php?id=2584
* Unified CStack health API
* Use CHealth for CStack count and health points
* increased SERIALIZATION_VERSION

lib/CGeneralTextHandler.cpp

@@ -508,3 +508,15 @@ CGeneralTextHandler::CGeneralTextHandler()
 		}
 	}
 }
+
+int32_t CGeneralTextHandler::pluralText(const int32_t textIndex, const int32_t count) const
+{
+	if(textIndex == 0)
+		return 0;
+	else if(textIndex < 0)
+		return -textIndex;
+    else if(count == 1)
+		return textIndex;
+	else
+		return textIndex + 1;
+}