DialogExecute wait for user changes, then 

calls Execute when we should render the menu we emit (signal (renderMenu(menuName)) -=> DialogExecute::slotRenderMenu
	-> DialogExecute::slotRenderMenu emit (signalRenderMenu (menuName)) -=> QDVDAuthor::slotRenderMenu
		-> QDVDAuthor::slotRenderMenu create a StartRenderMenu (pMenu) - object
		-> calls startMenuRender.renderDVDMenu ()


static StartMenuRender::registerToRenderMenu
	Called from nowhere ... 
	->Creates new StartMenuRender(pMenu)-object and adds to static list.

static StartMenuRender::registerToExtract
	Called from MovieObject - timer when user created a new movie object (30 secs delay).
	->Creates new StartMenuRender(movieObject)-object and adds to static list.

StartMenuRender::renderDVDMenu
	Called from Execute-Object or listFifo
	->checks if already created (statusFile)
	->checks if currently beeing created and if so wait for thread to finish
	->otherwise run()->renderDVDMenu() in thread 

StartMenuRender::renderMovieObject
	Called from listFifo when stored object = movieObject (See also registerToExtract)
	->extracts all images required to render this movie object
	->writes status file.


RENDERING process:
currently : 
ButtonPreview::drawContents (QPainter) calls
	m_listMenuObjects[t]->drawContents (QPainter)

we need : 
ButtonPreview::drawContents (QPainter, int iFrameNumber) calls
	m_listMenuObjects[t]->drawContents (QPainter, iFrameNumber, iTotalFrames)



OBSOLETE function : 
	DVDMenu::slotRenderMenu
	>bool StartMenuRender::checkStatusFileDone ()<, use instead >int StartMenuRender::checkStatusFile ()<