增加Settings的reversePainter可设置Serie的绘制是否逆序

Editor/PropertyDrawers/SettingsDrawer.cs

@@ -27,6 +27,7 @@ namespace XCharts
                     chart.settings.Reset();
                 }
                 ++EditorGUI.indentLevel;
+                PropertyField(prop, "m_ReversePainter");
                 PropertyField(prop, "m_MaxPainter");
                 PropertyField(prop, "m_LineSmoothStyle");
                 PropertyField(prop, "m_LineSmoothness");