~thon/thon

ref: c5ed5b1cb60a11eed7efc361f6e99e40ea6fe483 thon/parse/parse.sml -rw-r--r-- 1.4 KiB
Start repl function
Parse and run strings and files
Fix func app parsing precedence; SARROW is right assoc

Also add a handful of toy programs. Need someway to automatically run
and verify all of them.
Parse lambdas and nat type
I can parse zero and one from a file now
Start splitting into structures

Can't access typeof yet; think I need to split into separate struct for
that.