Make Dispenser/Dropper able to place blocks

**Is your feature request related to a problem? Please describe.**
It isn't.

**Describe the solution you'd like**
I believe it could be awesome if Dispensers and Droppers were able to place blocks like they are able to place shulkerboxes. This could be done with an IC (a Sign placed on the Dispenser/Dropper) but a more elegant solution would be a different way to toggle between block-placing and block-dropping mode. That way the Dispenser/Dropper could be moved around with a piston without the block placing mechanism being destroyed.

You could build automatic wall/floor builders and many amazing redstone creations. Combined with flying machines, elaborate redstone and pipe mechanisms you could event set up a system that might be able to build you a pipe storage system (without signs of course) in any size you want (really just depending, when you would stop the flying machine).

**Describe alternatives you've considered**
There really isn't one I have found.