New system: railed builds

[macabe03]

railed builds concept is to place rails down, (like wires, pipes and shipping) construct and select a build, power a connected rail motor to make rails move, and manually, or by automation, move across the rails back or forth

rules: all builds must have a clear path and shouldn't intercept other builds. buildings should still have their original rules e.g. hanging pot needs a block above. and radiation lamp / wall toilet need a block next to them etc. the entire build needs to be connected. neutronium can't be moved

details: if possible, builds should run smoothly and not jump from one block to another. like normal errands, selecting railed builds use a drag, release and confirm system. rails should look like roller coaster chains/bike chains