improve struct & class editor GUI

Add support to draw default GUI for user-defined struct & class.

Author: YT-GameMaker

PostProcessing/Editor/PostProcessEffectBaseEditor.cs

@@ -148,7 +148,17 @@ protected void PropertyField(SerializedParameterOverride property, GUIContent ti
                     }
 
                     // Default unity field
-                    EditorGUILayout.PropertyField(property.value, title);
+					if (property.value.hasVisibleChildren
+						&& property.value.propertyType != SerializedPropertyType.Vector2
+						&& property.value.propertyType != SerializedPropertyType.Vector3)
+					{
+						GUILayout.Space(12f);
+						EditorGUILayout.PropertyField(property.value, title, true);
+					}
+					else
+					{
+						EditorGUILayout.PropertyField(property.value, title);
+					}
                 }
             }
         }