Devoncarew properties dialog

Various tweaks to the Properties and the Settings dialogs:

- move the `Properties...` menu item to the bottom of the context menu
- the Properties dialog title changes to `Project Properties`, `Folder Properties`, or `File Properties` depending on content
- git clone dialog field selects any text in the url field when it opens
- don't show the location field in the Setting dialog on Chrome OS - right now we're always using syncfs

@sunglim for review