renamed terawatt-prism.* -> prismx.*; some build.xml cleanup for machine stl compile;
finally fixed syntax error in 60-inside-top;
fixed include errors;
updated PrismX model SCAD and STL to work with fixes across repo;
fixed z-pos in p12;
added tools/MCAD although nut_clamps is the only file that uses it;
added p12, p13 to dist/stl/plates;