[TechDraw] Use function overloadin and avoid code repeat

src/Mod/TechDraw/Gui/QGCustomBorder.cpp

@@ -51,12 +51,7 @@ QGCustomBorder::QGCustomBorder()
 
 void QGCustomBorder::centerAt(QPointF centerPos)
 {
-    QRectF box = boundingRect();
-    double width = box.width();
-    double height = box.height();
-    double newX = centerPos.x() - width/2.;
-    double newY = centerPos.y() - height/2.;
-    setPos(newX,newY);
+    centerAt(centerPos.x(), centerPos.y());
 }
 
 void QGCustomBorder::centerAt(double cX, double cY)

src/Mod/TechDraw/Gui/QGCustomClip.cpp

@@ -55,7 +55,7 @@ QGCustomClip::QGCustomClip()
 
 void QGCustomClip::centerAt(QPointF centerPos)
 {
-    centerAt(centerPos.x(),centerPos.y());
+    centerAt(centerPos.x(), centerPos.y());
 }
 
 void QGCustomClip::centerAt(double cX, double cY)

src/Mod/TechDraw/Gui/QGCustomImage.cpp

@@ -51,7 +51,7 @@ QGCustomImage::~QGCustomImage()
 
 void QGCustomImage::centerAt(QPointF centerPos)
 {
-    centerAt(centerPos.x(),centerPos.y());
+    centerAt(centerPos.x(), centerPos.y());
 }
 
 void QGCustomImage::centerAt(double cX, double cY)

src/Mod/TechDraw/Gui/QGCustomLabel.cpp

@@ -55,12 +55,7 @@ QGCustomLabel::QGCustomLabel()
 
 void QGCustomLabel::centerAt(QPointF centerPos)
 {
-    QRectF box = boundingRect();
-    double width = box.width();
-    double height = box.height();
-    double newX = centerPos.x() - width/2.;
-    double newY = centerPos.y() - height/2.;
-    setPos(newX,newY);
+    centerAt(centerPos.x(), centerPos.y());
 }
 
 void QGCustomLabel::centerAt(double cX, double cY)

src/Mod/TechDraw/Gui/QGCustomRect.cpp

@@ -51,12 +51,7 @@ QGCustomRect::QGCustomRect()
 
 void QGCustomRect::centerAt(QPointF centerPos)
 {
-    QRectF box = boundingRect();
-    double width = box.width();
-    double height = box.height();
-    double newX = centerPos.x() - width/2.;
-    double newY = centerPos.y() - height/2.;
-    setPos(newX,newY);
+    centerAt(centerPos.x(), centerPos.y());
 }
 
 void QGCustomRect::centerAt(double cX, double cY)

src/Mod/TechDraw/Gui/QGCustomSvg.cpp

@@ -51,7 +51,7 @@ QGCustomSvg::~QGCustomSvg()
 
 void QGCustomSvg::centerAt(QPointF centerPos)
 {
-    centerAt(centerPos.x(),centerPos.y());
+    centerAt(centerPos.x(), centerPos.y());
 }
 
 void QGCustomSvg::centerAt(double cX, double cY)

src/Mod/TechDraw/Gui/QGCustomText.cpp

@@ -65,7 +65,7 @@ QGCustomText::QGCustomText(QGraphicsItem* parent) :
 
 void QGCustomText::centerAt(QPointF centerPos)
 {
-      centerAt(centerPos.x(),centerPos.y());
+      centerAt(centerPos.x(), centerPos.y());
 }
 
 void QGCustomText::centerAt(double cX, double cY)

src/Mod/TechDraw/Gui/QGDisplayArea.cpp

@@ -52,7 +52,7 @@ QGDisplayArea::QGDisplayArea(void)
 
 void QGDisplayArea::centerAt(QPointF centerPos)
 {
-    centerAt(centerPos.x(),centerPos.y());
+    centerAt(centerPos.x(), centerPos.y());
 }
 
 void QGDisplayArea::centerAt(double cX, double cY)