osc.lua: add slimbox width option and preserve width values for box slimbox docs: update default box and slimbox width values in OSC configuration docs: add `boxwidth` and `slimboxwidth` script options to osc
osc.lua: add slimbox width option and preserve width values for box slimbox docs: update default box and slimbox width values in OSC configuration docs: add `boxwidth` and `slimboxwidth` script options to osc