cleaned up phasmascapes

two tweaks to 'clean' up the look of phasmascapes - removing the screen-like lines, and removing the iron details framing the sides of ground-sitting phasmascapes.
both options are individually toggle-able, if you only want one of the improvements

in order to ensure it does not look weird/have gaps when people do have the frame showing, I have kept the frame intact, but i think it still looks more immersive in builds

affects all phasmascapes as of 7.5, including the sky-style phasmascapes in the case of line removal. should work with modded phasmascapes too, assuming they don't modify the same normal map!