#414 Add "Create Desktop Shortcut" to file context menu.

[Lonely Stranger]

Forwarded from https://bugs.launchpad.net/ubuntu/+source/pcmanfm/+bug/1599973

By Pierre: "I would suggest you add in PCManFM's right-click context menu an option to "Create desktop shortcut" as the CTRL-SHIFT-DRAG feature is not well known among regular users (non-geeks). It would make PCManFM more user friendly for newbies... one less frustration in switching over from Windows."