Added Slimeball Feature

It would be helpful for redstone builders if the slimeball could be used to stick two blocks together- similar to a slime block but without the block. The slimeball could be placed onto a block similarly to redstone dust and then used to semi-perminantly attach a block to it- for use such as with pistons. I came across and issue today in trying to build a hidden bookcase (the bookcase block does not match my flooring so I wanted to be able to have the block I use for flooring atop the bookcase- however that would not work because when pushed up and pulled back down the only block being maneuvered is the bookcase and not the solid block atop of it. This would be really helpful for this reason both mechanically and aesthetically.