Make the LexingException say which character caused it.
Add more operators to the symbols.
Rename the contents and comment field to value.
Add a text field to the symbols.
Add a long boolean field to the comments.
Update the sample with more code and token types.
Add the DOT (.) symbol.
Update the sample with a usage of the dot operator.
Add a basic parser module and class.
Add a printing script which lexes sample.nwjs and prints
the lexemes found in the console.