Support per-domain scope (in addition to per-site and global)

[gorhill]

Example: https://*.google.com

Need to think of a UI to allow that easily. Maybe instead of the currently botched top left icon, a kind of drop down menu where the user chooses the scope, with three choices:

*
https://*.google.com
https://groups.google.com

Where:

Global scope = *
Per-domain scope = {scheme}://*.{domain}
Per-site scope = {scheme}://{hostname}

Than evaluation code would work like this:

{scheme}://{hostname} exists?
Yes : lookup rules and evaluate
No : {scheme}://*.{domain} exists?
Yes : lookup rules and evaluate
No : lookup global rules and evaluate

[gorhill]

Fixed in bdbee23