Began adding AST tree branches to handle float, char, scientific notation. Also started adding tree visiting
Rearranged the order in tokens text file for better readability
Can't add DoubleQuote " to the token as that creates an error in the auto generated Java files
Because I rearanged the meaning of Int and Integer in the tokens file to the way they are meant to be;
I had to change the lexer.  I also removed the Scientific type because we are using float types for that.
Added the adt trees for hw3.  Added ASTVisitor stuff too
Enabled jar command line arguments
Added unimplemented abstract methods to Codegen and Constrainer so it compiles in jar.
These are not currently used because they are commented out in compiler.Compiler main method