Bug 127289 [Markers] SystemFilter and group selection state not preserved
We are not preserving the selection state of the system filters or which group is selected.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/MarkerFilter.java
* 
	 * @param typeName
	 * @return MarkerType
	 */
	MarkerType findMarkerType(String typeName) {
		return MarkerTypesModel.getInstance().getType(typeName);
	}
	/**
	 * Restore the state of the receiver in the supplied settings.
	 * 
	 * @param memento
	 */
	protected void restoreFilterSettings(IMemento memento) {
		String setting = memento.getString(TAG_ENABLED);
		if (setting != null) {
			enabled = Boolean.valueOf(setting).booleanValue();
		}
		Integer resourceSetting = memento.getInteger(TAG_ON_RESOURCE);
		if (resourceSetting != null) {
			onResource = resourceSetting.intValue();
		}
		
		
		setting = memento.getString(TAG_SELECTION_STATUS);
		if (setting != null) {
			selectedTypes.clear();
			
			List newTypes = new ArrayList();
			addAllSubTypes(newTypes);
			StringTokenizer stringTokenizer = new StringTokenizer(setting);