Added the possibility to change the parser according to the prefered one.
Custom parser come with their associated lexer.
Reset the default lexer to an empty one.
Added the C file management.
Added C-style (nested) comment support.
Added the main function.
Added parse error handler.
Added bindings (and the C-style value definition).
Factorized the literal definition.
Added closures.
Added various syntax elements.
Added function definitions and sequences.