refactored to use 'into' to merge hash-maps, instead of rebuilding them from scratch or doing multiple assocs
refactored destructuring of function and let parameters in create/disambiguate-minus-signs
minor line clarity change in create/disambiguate-minus-signs
extensive refactoring and shortening in create/map-labels
altered parse and compile to add beginnings of error-checking framework (also added tests for this)
minor change; restored testing with equals sign rather than tset literals for one item
loaded core.match
fixed bug causing ENDSUB not to parse properly; also added tests
added SPEEDX and SPEEDY to list of registers which have an effect on the world
added tests for robot-tick
corrected registers-with-effect-on-world list again
refactored tick-robot to use 'into' instead of multiple assocs and an increment function