Make port checks more permissive
Get rid of input handlers for now
Minor changes to checks for ports
Generate conversion code for ports
Allow the title port to work on Strings and Signals of Strings
cosmetic: simplify traversal of maybe
Make instanceof check safer, check if it's an object before using instance of
Fix checks for node.js on stdout and stderr ports
Show nicer error messages when module initialization fails due to invalid port values
Handle signals properly, fix outgoing lists, improve errors for missing fields
cosmetic: generalize `collectLambdas` to make a list of types, move prettifying code to the Pretty instance
Correct check for outgoing higher order functions

A function can appear arbitrarily nested in a data structure, but that
function cannot have more functions within it.
Disallow signals-of-signals, functions that involve signals, and signals of functions
Handle function exports
Give nicer error messages when user provides values for ports that do not exist
Rename "output" to "ports" and "input" to "signal"