Merge pull request #84 from XChinux/master

Format TcArrowButton's source code
已修改(by younghz)
Merge pull request #85 from younghz/master

已修改(by younghz)
添加文本编辑器上方用的标尺控件
把TcTextRuler加入到工程
重新实现KeyPressEvent
Merge pull request #86 from younghz/master

重新实现KeyPressEvent