add setWindowFlags(Qt::Window) to improve window management

* improves window handling a lot
	(on Linux GNOME 3 at least: quickly resizing windows left/right, not forced in foreground anymore etc.)
	setWindowFlags() inserted in all *window.cpp files except mainwindow
    * some whitespace at EOL trimmed

re/udsscanwindow.cpp

@@ -11,6 +11,7 @@ UDSScanWindow::UDSScanWindow(const QVector<CANFrame> *frames, QWidget *parent) :
     ui(new Ui::UDSScanWindow)
 {
     ui->setupUi(this);
+    setWindowFlags(Qt::Window);
 
     modelFrames = frames;