cli: Add "notes" command

The "notes" command will show the user what their notes for a particular
game are. The output can be piped anywhere the user wants, such as a
pager or a file.

If "notes" is passed with the "--edit" or "-e" flag, vgstash will open a
temporary file with the game's notes already inside and edit it using
the program pointed to by the EDITOR environment variable. When the
editor is closed (with a successful exit status), vgstash updates the
game's notes and exits.

The defaults for the testing environment ("cat" for non-interactive,
"vim" for interactive) may need tweaking on other operating systems.
Patches for these platforms are very welcome.

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