Added alpha version of interpreter and a shell. Beans programs can know be parsed, checked and executed.

Parser and lexer are working (together). Console created to bind input, output and computation along with some stdout and stderr library.

• Lexer full integration to beans
• patched a lot of bugs
• changed te from raw text parsing to token parsing

Lexer is now accessible from the beansast interface

Lexer grammar and token generator are functional, but not implemented yet with the parser and not available through the interface.