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

frameplaybackwindow.cpp

@@ -25,7 +25,7 @@ FramePlaybackWindow::FramePlaybackWindow(const QVector<CANFrame> *frames, QWidge
     ui(new Ui::FramePlaybackWindow)
 {
     ui->setupUi(this);
-
+    setWindowFlags(Qt::Window);
 
     int numBuses = CANConManager::getInstance()->getNumBuses();
     for (int n = 0; n < numBuses; n++) ui->comboCANBus->addItem(QString::number(n));
@@ -553,7 +553,7 @@ void FramePlaybackWindow::btnStopClick()
     {
         ui->tblSequence->setCurrentCell(0, 0);
         refreshIDList();
-    }    
+    }
     updateFrameLabel();
 }
 
@@ -594,7 +594,7 @@ void FramePlaybackWindow::changeSendingBus(int newIdx)
 void FramePlaybackWindow::changeIDFiltering(QListWidgetItem *item)
 {
     qDebug() << "Changed ID filter " << item->text() << " : " << item->checkState();
-    int ID = Utility::ParseStringToNum(item->text()); 
+    int ID = Utility::ParseStringToNum(item->text());
     currentSeqItem->idFilters[ID] = (item->checkState() == Qt::Checked) ? true : false;
 }