Add a way for the user to be able to copy a file's path

Allow the user to copy the selected file's path. This is useful on a number of occasions, such as copying, removing or otherwise manipulating in other software/console songs from Rhythmbox's playlist. Right now the only alternative is to right click the song, go to Properties and copy in two steps the filename and the path from the two textfields from the Details tab.
This could be done by adding a new item to the context menu of the selected item or by adding a new entry in the Edit menu called "Copy file path" which would have Ctrl+Shift+C assigned as a keyboard shortcut.
If multiple files are selected this feature should copy all the selected items' paths to the clipboard separated by newline characters.