Update Bookmark per Andrey Hohutkin

This add-on allows to replace or update an existing bookmark title and/or URL with a minimal click count..
Usage:
First way:
- Press on add-on icon in toolbar (or Ctrl-Q).
- Update a bookmark with three options:
- Press Ctrl-Space (also on MacOS)
- Double-click on desired bookmark to update.
- Click a button

Alternate way:
- Select any bookmark and click Right Button
- Select context menu "Update bookmark"

If you use a keyboard shortcut to update bookmarks you may choose to update URL and/or title in Add-on "Settings" page. It is useful when you don't wish to update titles by default.