左侧目录树优化，及搜索部分样式调整，部分图片路径更改

shuishen

2021-06-11 95c1f10a276a69ce4fdcc72e68a35c796581d143

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<div>
  <div class="jimu-panel-title" data-dojo-attach-point="titleNode">
    <div class="max-btn jimu-vcenter jimu-float-trailing" data-dojo-attach-point="maxNode"></div>
  </div>
  <div class="jimu-container" data-dojo-attach-point="containerNode">
    <div class="empty-tip">${nls.emptyPanelTip}</div>
  </div>
</div>