为 C++ 代码添加许可证头模板
在Preferences >C++ >File Naming >License template 中指定一个有 C++ 许可证头的文件。
许可证文件可能有特殊的占位符，用%% 括起来，生成新文件时替换这些占位符：
%YEAR%:年份%MONTH%:月%DAY%:月日%DATE%:日期%USER%:用户名%FILENAME%:文件名%CLASS%:类名（如适用）%$VARIABLE%:环境变量VARIABLE的内容。
此外，%{...} 形式的占位符将被相应Qt Creator 变量的值替换。
另请参阅 使用Qt Creator 变量。
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