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/IDEWorkbenchPlugin.java
/**
	 * Creates an extension.  If the extension plugin has not
	 * been loaded a busy cursor will be activated during the duration of
	 * the load.
	 *
	 * @param element the config element defining the extension
	 * @param classAttribute the name of the attribute carrying the class
	 * @returns the extension object
	 */
	public static Object createExtension(final IConfigurationElement element, final String classAttribute) throws CoreException {
		
		
		IPluginDescriptor plugin = element.getDeclaringExtension().getDeclaringPluginDescriptor();
		if (plugin.isPluginActivated()) {
			return element.createExecutableExtension(classAttribute);
		} else {
			final Object[] ret = new Object[1];
			final CoreException[] exc = new CoreException[1];
			BusyIndicator.showWhile(null, new Runnable() {
				public void run() {
					try {
						ret[0] = element.createExecutableExtension(classAttribute);
					} catch (CoreException e) {
						exc[0] = e;
					}
				}
			});
			if (exc[0] != null)
				throw exc[0];
			else