parser.py, ebnf.py: Allow Parsers for resume-skipping (refactorings pending)

experimental/JSON/serialization_demo.py

-import sys, os
-
-try:
-    scriptpath = os.path.dirname(__file__)
-except NameError:
-    scriptpath = ''
-dhparser_parentdir = os.path.abspath(os.path.join(scriptpath, r'../..'))
-if scriptpath not in sys.path:
-    sys.path.append(scriptpath)
-if dhparser_parentdir not in sys.path:
-    sys.path.append(dhparser_parentdir)
-
-import JSONParser
-
-if __name__ == "__main__":
-    syntax_tree = JSONParser.parse_JSON('{ "one": 1, "two": 2 }')
-    JSONParser.transform_JSON(syntax_tree)
-    print(syntax_tree.as_sxpr())
-    print(syntax_tree.as_json(indent=None))
-    print(syntax_tree.as_xml())
-    print(syntax_tree.as_tree())
-