Colorize tabs with URL/title regex match

[bviefhues]

Would be great if Sidebery offered to colorize tabs based on URL or title regex matches.

For that, Sidebery would maintain a user-editable list of

• regular expression,
• option to match URL, title or either,
• tab color.

Match should be on URL, not on domain only, as there are use cases which rely on path information.

[mbnuqw]

Related: #946