meant to be used when something is placed against the side, so that that
thing appears to be mounted to the strut, such as a Technic mains
transformer ("supply converter") mounted near the top of a tall electrical
pole.
Note: uses wallmounted param2 to allow rotation, rather than facedir
mode. I want to allow for Unified Dyes colorization of a derivative of
this node in another mod, and wallmounted mode uses fewer bits for
rotation than facedir, leaving more for color info.
They are accessed by explicitly trying to place the regular raillike version
onto a wall or ceiling. When placed onto the floor, the normal raillike one is
produced.
also, deleted some redundant texture entries
very minor code rearrangement
