Hot-key for dismantling and cancelling

- There should be a hot key (industry default is the Delete key) for dismantling or cancelling. You select a wall, you hit Delete, it gets marked to dismantle it. You select a wall blueprint, hit Delete, the blueprint goes away and there are no longer orders to build it. Same with crafting tables. You select an item, hit Delete, and it removes that project from the crafting table.