The code generated by the generator now also writes the files
on_response(...) method. Also, all the generated files are
saved in a dictionary containing `constructorId: class`
The code generated by the generator now classifies the output files
in their corresponding categories, also writing their __init__(...)
with documented arguments, and the on_send(...) method
A TLObject class has been added, as well as a method for tokenizen .tl files.
A TLObject can be created by simply calling `TLObject.from_tl(tl_line)`,
this will tokenize the .tl line and return a new TLObject with all
the required properties extracted.
Also added another method to load .tl files and yield TLObjects, including
a SourceBuilder that can be later used to generate Python code.
