Bug 123496 [IDE] Use operation validation API for IDE actions
We should use the Resources/Core operation validation API in the IDE actions for manipulating resources.
bundles/org.eclipse.ui.ide/extensions/org/eclipse/ui/actions/CopyFilesAndFoldersOperation.java
* 
	 * @param fileNames
	 *            names of the files to copy
	 * @param destination
	 *            destination to which files will be copied
	 * @param monitor
	 *            the monitor that information will be sent to.
	 * @see WorkspaceModifyOperation
	 * @see WorkspaceJob
     * @since 3.2
	 */
	public void copyFilesInCurrentThread(final String[] fileNames, IContainer destination,
			IProgressMonitor monitor) {
		IFileStore[] stores = buildFileStores(fileNames);
		if (stores == null)
			return;
		copyFileStores(destination, stores, false, monitor);
	}
	/**
	 * Build the collection of fileStores that map to fileNames. If any of them
	 * cannot be found then match then return null.
	 * 
	 * @param fileNames
	 * @return IFileStore[]
	 */
	private IFileStore[] buildFileStores(final String[] fileNames) {
		IFileStore[] stores = new IFileStore[fileNames.length];
		for (int i = 0; i < fileNames.length; i++) {
			IFileStore store = IDEResourceInfoUtils.getFileStore(fileNames[i]);
			if (store == null) {