CComponentsItem: move/rename doCenter()to base class CComponentsItem

So it's possible to use this method for all cc-items.
setCenterPos() comes now with parameter 'along_mode' (CC_ALONG_X, CC_ALONG_Y).
So it's possible to center in x or y direction. As default are
both directions predefined.


Origin commit data
------------------
Commit: 8a897103ac
Author: Thilo Graf <dbt@novatux.de>
Date: 2014-02-27 (Thu, 27 Feb 2014)

src/gui/components/cc_frm_window.cpp

@@ -29,7 +29,6 @@
 #include <global.h>
 #include <neutrino.h>
 #include "cc_frm_window.h"
-#include <driver/screen_max.h>
 
 using namespace std;
 
@@ -146,11 +145,6 @@ void CComponentsWindow::initWindowPos()
 		y = frameBuffer->getScreenY();
 }
 
-void CComponentsWindow::doCenter(){
-	x = cc_parent ? cc_parent->getWidth() - width/2 : getScreenStartX(width);
-	y = cc_parent ? cc_parent->getHeight() - height/2 : getScreenStartY(height);
-}
-
 void CComponentsWindow::setWindowCaption(neutrino_locale_t locale_text, const int& align_mode)
 {
 	ccw_caption = g_Locale->getText(locale_text);