Include better linting support and resolve findings from linters

[antazoey]

Currently, if you run black, isort, flake8, etc, you will discover opportunities and clean up the code.

I propose we include the following files:

(.pre-commit-config.yaml):

repos:
-   repo: https://github.com/pre-commit/pre-commit-hooks
    rev: v4.2.0
    hooks:
    -   id: check-yaml

-   repo: https://github.com/pre-commit/mirrors-isort
    rev: v5.10.1
    hooks:
      - id: isort

-   repo: https://github.com/psf/black
    rev: 22.6.0
    hooks:
      - id: black
        name: black

-   repo: https://gitlab.com/pycqa/flake8
    rev: 4.0.1
    hooks:
    -   id: flake8

-   repo: https://github.com/pre-commit/mirrors-mypy
    rev: v0.971
    hooks:
    -   id: mypy


default_language_version:
    python: python3

(pyproject.toml):

[tool.mypy]
exclude = "build/"

[tool.black]
line-length = 100
target-version = ['py39', 'py310']
include = '\.pyi?$'

[tool.isort]
line_length = 100
force_grid_wrap = 0
include_trailing_comma = true
multi_line_output = 3
use_parentheses = true

(setup.cfg):

[flake8]
max-line-length = 100
exclude =
	venv*
	docs
	build
	.eggs