* fix: qmake linux build
* little fix for the "Quick" example
Window.qml / ApplicationWindow.qml: fix: "FramelessApplicationWindow.onClosing" is not available in org.wangwenx190.FramelessHelper 1.0.
* remove xcb - as requested
1. Added WindowBorderPainter for QtWidgets
2. Added WindowBorder for QtQuick (uses WindowBorderPainter internally)
3. Adjust some header includes
4. Limit a Linux workaround to the appropriate Qt versions
Signed-off-by: Yuhang Zhao <2546789017@qq.com>