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
* The constant for grouping entries.
	 */
	public static final String MARKER_GROUPING_ENTRY = "markerGroupingEntry"; 
	private static final Object SEVERITY_ID = "org.eclipse.ui.ide.severity";
	/**
	 * The tag for content generators.
	 */
	static final String MARKER_CONTENT_GENERATOR = "markerContentGenerator"; 
	/**
	 * The tag for content generator.
	 */
	private static final String MARKER_CONTENT_GENERATOR_EXTENSION = "markerContentGeneratorExtension"; 
	private static final String MARKER_FIELD = "markerField"; 
	private static final String ATTRIBUTE_CLASS = "class"; 
	/**
	 * The bookmarks generator.
	 */
	public static final String BOOKMARKS_GENERATOR = "org.eclipse.ui.ide.bookmarksGenerator"; 
	/**
	 * The tasks generator.
	 */
	public static final String TASKS_GENERATOR = "org.eclipse.ui.ide.tasksGenerator"; 
	/**
	 * The problems generator.
	 */
	public static final String PROBLEMS_GENERATOR = "org.eclipse.ui.ide.problemsGenerator"; 
	
	/**
	 * The all markers generator.
	 */