Bug 221521 [Markers] New markers API needs to be pared down
We have too much API in some of the new classes and they can be moved to internals
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/MarkerSupportRegistry.java
private static final Object PROBLEM_FILTER = "problemFilter";
	private static final String SCOPE = "scope"; 
	private static final String SELECTED_TYPE = "selectedType"; 
	private static final String SEVERITY = "severity";
	/**
	 * The key for marker type references.
	 */
	public static final String MARKER_TYPE_REFERENCE = "markerTypeReference"; 
	private static final String MARKER_CATEGORY = "markerTypeCategory";
	/**
	 * The markerAttributeMapping element.
	 */
	public static final String ATTRIBUTE_MAPPING = "markerAttributeMapping"; 
	/**
	 * The tag for marker grouping.
	 */
	public static final String MARKER_GROUPING = "markerGrouping"; 
	/**
	 * The value attribute.
	 */
	public static final String VALUE = "value"; 
	/**
	 * The label attribute
	 */
	public static final String LABEL = "label"; 
	/**
	 * The attribute grouping element name.
	 */
	public static final String MARKER_ATTRIBUTE_GROUPING = "markerAttributeGrouping";
	/**