Split terminal: fullscreen

We need 2 fullscreen modes, somehow:
- fullscreen of the tab (could be a new item in the tab context menu)
- "fulltab" on the current terminal (ie hide all others terminal in current tab). Not necessarily go fullscreen. To go fullscreen on current terminal we would require 2 hotkeys

Maybe also:
- current "linked" terminals could stay shown (so hide only all other non-linked terminals)
- iterm2 has a "bury" features that hides a terminal in a menu so that it doesnot show anymore until it is "unburried" later.