evalweb: Drop .parser from imports

from flask import Blueprint, render_template, request

from flask_wtf import FlaskForm  # type: ignore

from wtforms import RadioField   # type: ignore

from lib.parsing.parser import ParsingError

from lib.parsing import ParsingError

from evalweb.web_checker import WebChecker, Language, CompositeException

from evalweb.examples import examples, convert_examples

from typing import Optional

from typing import Dict, Tuple

from lib.parsing.parser import Parser

from lib.parsing import Parser

parser = Parser()

examples: Dict[Tuple[str, str], Tuple[str, str]] = {}

import lib.reg as reg

from lib.parsing.parser import Parser, ParsingError

from lib.parsing import Parser, ParsingError

from lib.checker import transform, dfa_transform, nfa_transform, check_task, \

                        check_alphabets

from typing import List, Optional