Feature request: tabbed mode

[diamond-lizard]

The i3 window manager has a "tabbed" mode, which works like this:

• Only a single window is ever displayed on any monitor
• All other windows on the same monitor are hidden behind the front window
• The title bars of every window appear next to one another, with the front window's title bar (and other window decorations) being of a different color from the rest so the user can easily tell them apart.
• There are keyboard shortcuts to allow bringing the next/previous window to front.

I'd like to request that something like this mode be made for rwind.