Automatically fetch uri title

[dhth]

Describe the solution you'd like
Add a flag to bmm save and bmm save-all that will automatically fetch the title (and maybe some tags??) from the uri's remote host

Is your feature request related to a problem? Please describe.
This will remove the need for manually entering the title for bookmarks.

Describe alternatives you've considered
Hack together a solution using a shell script.

Additional context
NA