v0.12.7

Repair table operation row and column failure [Important]
Copy Markdown code to remove unnecessary blank lines
Optimize some behaviors of keyboard operations
Picture storage folder configurable

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修复表格操作行列失效【重要】
复制Markdown代码去掉不必要的空白行
优化键盘操作的部分行为
图片存储文件夹可配置