Error Messaging Redesign

This commit contains the following:

* New data types to support full tracebacks
* New traceback data type used across stl and ast
* Updates to tests
* fixes for error messaging in sym and some stl functions

Readme.org

@@ -488,8 +488,6 @@ Note: this section will not show the status of each item unless you are viewing
 Note: this section only tracks the state of incomplete TODO items. Having everything on here would be cluttered.
 
 ** TODO alpha tasks
-- circuit should actually be ~(reduce (lambda (form state) (and state (bool form))) my-args)~
-- error display must improve at all costs
 - exit function (causes program to shut down and return code)
 - probably push the symtable inserts into functions in individual stl modules (like posix.rs does)
 - fix the links in the readme like the ones in shell.org
@@ -538,3 +536,6 @@ Note: this section only tracks the state of incomplete TODO items. Having everyt
   - TCP Listener
   - HTTP Listener
   - UDP Listener
+
+* Special thanks
+Special thanks to [[https://nul.srht.site/]['Underscore Nul']] for consulting with me in the early stages of this project. Meeting my goal of only using safe rust (with the exception of the posix module) would have been a much bigger challenge if not for having someone to experiment with design ideas with.