TODOS

• Add namespaces ala C++

  Allow

  (namespace FOO
    (defun function-x ...)
    (defconstant A ...)
    )
  
  And allow at the top level or defun scope.
  
  (using FOO)
  (using FOO A)
  (using FOO function-x)
  

• Environment organization sorting by sha256tree rather than name (incompatible change)

• Have cldb spin up a repl at the expression that failed.