Easier Cushion stacking / Led Displays

It is currently possible to place multiple cushions on top of one another, but the process is a bit tedious. We should be able to directly place cushions onto other cushions simply by crouching and right clicking. As well, it used to be possible to create Led Displays using cushions by placing them in a way they would clip through the top of Redstone Lamps, causing them to be blacked out until the lamps are lit. This was patched out, making it so cushions don't turn black when clipping into blocks. I generally like this change very much, but I do think they should revert it *only* with Redstone Lamps and Copper Bulbs, so people can still have Led Displays. Best of both worlds, really.