Add a DOUBLE stash tab as a MTX option (same price as Quad)

I think a great idea would be to add a DOUBLE tab option for stashes.

I would be 17x17 (or 16x16/18x18) if they are programmed to always been even.

Price it the same as a Quad tab and offer an option to upgrade a stash tab to the DOUBLE version.

I would buy a ton because I find Quads just too big and difficult to use in 4K and the standard 12x12 is really small.

Pricing it the same as a quad would not cannibalize QUAD tab sales.