Bug 303682 [Compatibility] Create the legacy handler service
bundles/org.eclipse.e4.core.commands/src/org/eclipse/e4/core/commands/internal/HandlerServiceImpl.java
static final String METHOD_EXECUTE = "execute"; 
	static final String METHOD_CAN_EXECUTE = "canExecute"; 
	final static String H_ID = "handler::"; 
	final static String PARM_MAP = "parmMap::"; 
	final static String HANDLER_LOOKUP = "org.eclipse.e4.core.commands.EHandlerLookup"; 
	final static String LOOKUP_HANDLER = "handler"; 
	private IEclipseContext context;
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.e4.core.commands.EHandlerService#activateHandler(java.lang.String,
	 * java.lang.Object)
	 */
	public void activateHandler(String commandId, Object handler) {
		String handlerId = H_ID + commandId;
		context.set(handlerId, handler);
	}
	/**
	 * @param command