Typo fix to "Hello, World!" test file.4
Updated Lexer for deleted keywords. Also fixed bugs.
Changed default mode to dump.
Minor fix to the Language Spec.
Changed the Lexer to allow running LIST and DUMP modes together.
Changes to Parser and main.cpp in preparation for adding and AST.

These changes are not finished yet; there is still a lot of work to be
done. This is just so I can go to bed tonight.
Added the 02_codegen folder.

These changes include adding it to CMakeLists.txt, README.md and other
administrative files. Also added some very basic code to CodeGen.