capture QR codes from camera and major refactoring

- add GUI for QR code capturing from camera (CV2 is used)
- support different QR readers: ZBAR,QREADER,QREADER_DEEP,CV2,CV2_WECHAT
- support several input files
- add option to ignore duplicate otps
- write warnings and errors to stderr
- add output coloring
- rename project from extract_otp_secret_keys to extract_otp_secrets
- improve help
- clean verbose level output
- use Python type hints and check with mypy
- use f-strings
- clean up code
- add more tests
- calculate code coverage
- use src-layout: move files and folders
- support wheel packing
- enhance README.md
- bugfixes
    * fix -k -
    * fix utf-8 encoding on windows

utils.py

@@ -1,124 +0,0 @@
-# Author: Scito (https://scito.ch)
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-import csv
-import glob
-import io
-import json
-import os
-import re
-import shutil
-import sys
-
-
-# Ref. https://stackoverflow.com/a/16571630
-class Capturing(list):
-    '''Capture stdout and stderr
-Usage:
-with Capturing() as output:
-    print("Output")
-'''
-    def __enter__(self):
-        self._stdout = sys.stdout
-        sys.stdout = self._stringio_std = io.StringIO()
-        self._stderr = sys.stderr
-        sys.stderr = self._stringio_err = io.StringIO()
-        return self
-
-    def __exit__(self, *args):
-        self.extend(self._stringio_std.getvalue().splitlines())
-        del self._stringio_std    # free up some memory
-        sys.stdout = self._stdout
-
-        self.extend(self._stringio_err.getvalue().splitlines())
-        del self._stringio_err    # free up some memory
-        sys.stderr = self._stderr
-
-
-def file_exits(file):
-    return os.path.isfile(file)
-
-
-def remove_file(file):
-    if file_exits(file): os.remove(file)
-
-
-def remove_files(glob_pattern):
-    for f in glob.glob(glob_pattern):
-        os.remove(f)
-
-
-def remove_dir_with_files(dir):
-    if os.path.exists(dir): shutil.rmtree(dir)
-
-
-def read_csv(filename):
-    """Returns a list of lines."""
-    with open(filename, "r", encoding="utf-8", newline='') as infile:
-        lines = []
-        reader = csv.reader(infile)
-        for line in reader:
-            lines.append(line)
-        return lines
-
-
-def read_csv_str(str):
-    """Returns a list of lines."""
-    lines = []
-    reader = csv.reader(str.splitlines())
-    for line in reader:
-        lines.append(line)
-    return lines
-
-
-def read_json(filename):
-    """Returns a list or a dictionary."""
-    with open(filename, "r", encoding="utf-8") as infile:
-        return json.load(infile)
-
-
-def read_json_str(str):
-    """Returns a list or a dictionary."""
-    return json.loads(str)
-
-
-def read_file_to_list(filename):
-    """Returns a list of lines."""
-    with open(filename, "r", encoding="utf-8") as infile:
-        return infile.readlines()
-
-
-def read_file_to_str(filename):
-    """Returns a str."""
-    return "".join(read_file_to_list(filename))
-
-def read_binary_file_as_stream(filename):
-    """Returns binary file content."""
-    with open(filename, "rb",) as infile:
-        return io.BytesIO(infile.read())
-
-def replace_escaped_octal_utf8_bytes_with_str(str):
-    encoded_name_strings = re.findall(r'name: .*$', str, flags=re.MULTILINE)
-    for encoded_name_string in encoded_name_strings:
-        escaped_bytes = re.findall(r'((?:\\[0-9]+)+)', encoded_name_string)
-        for byte_sequence in escaped_bytes:
-            unicode_str = b''.join([int(byte, 8).to_bytes(1, 'little') for byte in byte_sequence.split('\\') if byte]).decode('utf-8')
-            print("Replace '{}' by '{}'".format(byte_sequence, unicode_str))
-            str = str.replace(byte_sequence, unicode_str)
-    return str
-
-
-def quick_and_dirty_workaround_encoding_problem(str):
-    return re.sub(r'name: "encoding: .*$', '', str, flags=re.MULTILINE)