Rename ItemValueSynchronizer to Synchronizer

src/mesh/ItemValueSynchronizer.hpp

-#ifndef ITEM_VALUE_SYNCHRONIZER_HPP
-#define ITEM_VALUE_SYNCHRONIZER_HPP
+#ifndef SYNCHRONIZER_HPP
+#define SYNCHRONIZER_HPP
 
 #include <ItemValue.hpp>
 #include <Connectivity.hpp>
 
 #include <map>
 
-class ItemValueSynchronizer
+class Synchronizer
 {
   template <ItemType item_type>
   using ExchangeItemTypeInfo = std::vector<Array<const ItemIdT<item_type>>>;
@@ -196,10 +196,10 @@ class ItemValueSynchronizer
   }
 
   PASTIS_INLINE
-  ItemValueSynchronizer()
+  Synchronizer()
   {
     ;
   }
 };
 
-#endif // ITEM_VALUE_SYNCHRONIZER_HPP
+#endif // SYNCHRONIZER_HPP

src/mesh/ItemValueUtils.hpp

@@ -300,7 +300,7 @@ void synchronize(ItemValue<DataType, item_type, ConnectivityPtr>& item_value)
 {
   static_assert(not std::is_const_v<DataType>, "cannot synchronize ItemValue of const data");
   if (parallel::size() > 1) {
-    static ItemValueSynchronizer synchronizer;
+    static Synchronizer synchronizer;
     synchronizer.synchronize(item_value);
   }
 }