文字编辑控件,继承自RichEdit,在编辑文字时，可以添加下拉选择栏，并可以为下拉框添加选项内容，并可以保存为模板xml文档，另外还实现了添加上下标、获取RTF文字等功能-Text editor control, inherited from RichEdit, edit the text at the time, you can add drop-down selection column, and can add options for the contents of the drop-

在RichEdit中载入Gif动画，类似QQ表情-In the RichEdit load Gif animation, similar to the expression QQ

insert bmp into richedit