Added a .tl file tokenizer and parser

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.

main.py

@@ -1,3 +1,8 @@
+from parser.tl_parser import TLParser
+
 
 if __name__ == '__main__':
-    print('Hello worldz! Wooho... This is harder than it looks!')
+
+    parser = TLParser()
+    for tlobject in parser.parse_file('parser/scheme.tl'):
+        print(tlobject)