usability improvements to env and def

* env prints variables and functions in seperate columns
* run/stl seperation of concerns significantly better
* def doesnt store lists or lambdas in the environment

Readme.org

@@ -488,12 +488,18 @@ 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
-- env prints without using columns
-- lambdas shouldn't hit the env
 - 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
         
 ** TODO v1.0 tasks
+- Be able to use features to compile without env or posix stuff
+  - add a new binary target that is a simple posix repl demo
+  - I think you'll need to refactor userlib to hide set behind a conditional
+    based on whether CFG_RELISH_POSIX is set or not
+  - add a compilation task to CI
 - finish basic goals in file:snippets/interactive-devel.rls
 - Investigate has_next member function for &Seg and maybe simplify stdlib and probably also eval/sym
 - Rename to Flesh