Outstanding
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    - Implement FORMAT
    - Implement lambdas
    - Implement LIST*
    - Implement macros
    - Implement packages
    - Implement READ and PRINT
    - Redefine DEFUN as a macro

Partially Done
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    P Implement keywords

Done
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    D Add ' notation for quote
    D Define NIL
    D Define T
    D Implement DEFPARAMETER
    D Implement DEFVAR
    D Implement IF
    D Implement LET
    D Implement LET*
    D Implement LIST
    D Implement PROGN
    D Implement QUOTE