* Tidy up right-click menu.
- Remove Bookmarks and Settings sub-menus (what on earth were they doing here?).
- Remove "Send Signal" sub-menu (still available via Edit -> Send Signal)
- Fix "Show Menubar" not reappearing after hiding/showing the menu bar a few times
* Remove the "Move Session Left / Move Session Right" items from the menu since the tab bar supports drag and drop reordering. A keyboard shortcut for moving tabs would still be
useful though.
* Remove clutter from window title. If a terminal has set the window title then just show that, otherwise show the session title. Fixes #63249