cleanup systems, simplify context / system distinction (oboy),

hunks/image/distanceTransform.js

hunks/image/thresholdrgba.js

hunks/image/vectorize.js

save/old-systems/dbg-l0-oneStepperUsb.json

save/old-systems/dbg-l0.json

save/old-systems/dbg-l1-3added.json

save/old-systems/dbg-l1-aReady.json

save/old-systems/dbg-l1-aSaturn.json

save/old-systems/dbg-l1-ab_ready.json

save/old-systems/dbg-l1-ab_tpath.json

save/old-systems/dbg-l1-abcReady.json

save/old-systems/dbg-l1-abc_msegs.json

save/old-systems/dbg-l1-abc_tpath.json

save/old-systems/dbg-lowerLevel.json

save/old-systems/dbg-pipe-ghost.json

save/old-systems/dbg-pipe-nolog.json

save/old-systems/dbg-pipe.json

save/old-systems/demo-system-jog-a.json

save/old-systems/fft.json

save/old-systems/lr-l1-abdef.json