Bug 154100 Platform level proxy settings
There are at least three proxy settings pages in Callisto. We will work with the Eclipse community to make sure that the core capabilities from these pages are made available at the Platform level, as a single settings page that can be consumed by all. [Runtime, Team, Update, UI]
bundles/org.eclipse.ui.ide.application/src/org/eclipse/ui/internal/ide/application/IDEWorkbenchAdvisor.java
* session; <code>null</code> if uninitialized. Key type:
	 * <code>String</code>, Value type: <code>AboutInfo</code>.
	 */
	private Map newlyAddedBundleGroups;
	/**
	 * Array of <code>AboutInfo</code> for all new installed features that
	 * specify a welcome perspective.
	 */
	private AboutInfo[] welcomePerspectiveInfos = null;
	/**
	 * Helper for managing activites in response to workspace changes.
	 */
	private IDEWorkbenchActivityHelper activityHelper = null;
	/**
	 * Helper for managing work that is performed when the system is otherwise
	 * idle.
	 */
	private IDEIdleHelper idleHelper;
	private Listener settingsChangeListener;
	
	/**
	 * Support class for monitoring workspace changes and periodically
	 * validating the undo history
	 */
	private WorkspaceUndoMonitor workspaceUndoMonitor;
	/**
	 * The IDE workbench error handler.
	 */
	private AbstractStatusHandler ideWorkbenchErrorHandler;
	/**