widgets.status: Copy paths to clipboard only when requested
It is bad form to clobber the user's clipboard on selection.
Make 'Copy Path to Clipboard' an explicit action which can be
triggered using either 'Ctrl+C' or the right-click context menu.
Interesting tidbit: usability studies have shown that average
computer users almost never use context menus. This suggests
that we may want to consider adding unobtrusive buttons to the
widget headers to make things more discoverable.
Closes #122
Suggested-by: Paolo G. Giarrusso (@Blaisorblade on github.com)
Signed-off-by: David Aguilar <davvid@gmail.com>