Generates Language class source by using xml file
with the language description. Descendants of this class
typically read some portion of the information
(e.g. integer token identifications) from the classes
generated by particular lexer.
author: Miloslav Metelka version: 1.00
Add the class to imports section. This method can be used
anytime even during the class source generation
because the imports are added to the generated source
at the end of the whole process.
Parameters: className - full name of the class including package name. the short name of the class name (without package).