wrap all library code into namespace if VCMI_LIB_NAMESPACE is defined

preparation for having client and server in a single process

lib/battle/CUnitState.cpp

@@ -19,6 +19,8 @@
 #include "../serializer/JsonDeserializer.h"
 #include "../serializer/JsonSerializer.h"
 
+VCMI_LIB_NAMESPACE_BEGIN
+
 namespace battle
 {
 ///CAmmo
@@ -952,3 +954,5 @@ void CUnitStateDetached::spendMana(ServerCallback * server, const int spellCost)
 }
 
 }
+
+VCMI_LIB_NAMESPACE_END