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.
On some several cases it's possible that full resulution is not
visible on SD output or video-out modes like 576i/p.
So it's makes more sense to use current osd-settings for max size and
position.
This fixes also current behavior of Imageinfo.
Member initVarWindow() now used with parameters, so it's possible
to remove multiple code in constructors, but some class must be
renamed to CComponentsWindowMax.
