forthFunctionCall: better handle invalid function calls
handle \r
improve compiler messages
ignore \r to check if a :[ ]: region is empty
remove old code
add initial do loop support
add new keyword break (alias for leave)
add support for getting the char code using ' e.g. 'R . outputs 82
add :js <name> { <args } ;|return; and :jsnoname { <args } ;|return; support
add new function ." text " is identical to " text " .
add code required for implementing begin while repeat
add code generator for :js and :jsnoname
fix pick and roll
add new function assert
add constant nil
add new operators === >= <= 0>= and 0<=
add new function see
replace readline repl with a real sforth repl, remove tests
add tests