Bug 49117 [Plan Item] Workbench needs hooks for new welcome support
M6 We need to provide an extension point and some interfaces to allow for a primary feature to declare a welcome page. This extension point will be tied the new IProduct being defined by the Core team and needs to have 3 states 1) Fill whole screen 2) Collapsed on the right when the user selects something and starts working 3) Disables when it is no longer of any use
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/IDEWorkbenchAdvisor.java
return;
	
		if (page.getPerspective() == null) {
			try {
				page = configurer.getWorkbench().showPerspective(id, win);
			} catch (WorkbenchException e) {
				ErrorDialog.openError(
					win.getShell(),
					IDEWorkbenchMessages.getString("Workbench.openEditorErrorDialogTitle"),  
					IDEWorkbenchMessages.getString("Workbench.openEditorErrorDialogMessage"), 
					e.getStatus());
				return;
			}
		}
	
		page.setEditorAreaVisible(true);
	
		
		IEditorPart editor = page.findEditor(input);
		if (editor != null) {
			page.activate(editor);
			return;
		}
	
		try {
			page.openEditor(input, WELCOME_EDITOR_ID);
		} catch (PartInitException e) {
			ErrorDialog.openError(
				win.getShell(),
				IDEWorkbenchMessages.getString("Workbench.openEditorErrorDialogTitle"),