Added two new menu items for hiding non-highlighted tabs and for bringing all hidden tabs back.

Added the ability to unhide specific tabs using a regular expression.

Added the ability to filter out tabs that match the regular expression by using the command "tf !".

This now allows:
- "tf reddit" to show all reddit tabs. Following this with "tf !funny" will hide all of the remaining tabs with "funny" in the URL or title. This can be repeated to filter out more and more tabs.