移除Pie组件，相关参数放到Settings中配置

Scripts/Editor/PieChartEditor.cs

@@ -15,13 +15,11 @@ namespace XCharts
         {
             base.OnEnable();
             m_Target = (PieChart)target;
-            m_Pie = serializedObject.FindProperty("m_Pie");
         }
 
         protected override void OnEndInspectorGUI()
         {
             base.OnEndInspectorGUI();
-            EditorGUILayout.PropertyField(m_Pie, true);
         }
     }
 }