Added method HashMap::Iterator::reset()

modules/juce_core/containers/juce_HashMap.h

@@ -424,6 +424,13 @@ public:
             return entry != nullptr ? entry->value : ValueType();
         }
 
+        /** Resets the iterator to its starting position. */
+        void reset() noexcept
+        {
+            entry = nullptr;
+            index = 0;
+        }
+
     private:
         //==============================================================================
         const HashMap& hashMap;