Add FlattenHierarchy to find special case of singletons (#90)

Add FlattenHierarchy to find special case of singletons

src/ObjectExplorer/SearchProvider.cs

@@ -163,7 +163,7 @@ namespace UnityExplorer.ObjectExplorer
             if (!string.IsNullOrEmpty(input))
                 nameFilter = input;
 
-            BindingFlags flags = BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Static;
+            BindingFlags flags = BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Static | BindingFlags.FlattenHierarchy;
 
             foreach (Assembly asm in AppDomain.CurrentDomain.GetAssemblies())
             {
@@ -181,7 +181,7 @@ namespace UnityExplorer.ObjectExplorer
                 }
             }
 
-            return instances;
+            return instances.Distinct().ToList();
         }
 
     }