Set up development tools

[webknjaz]

• pre-commit. Here's an example of .pre-commit-config.yaml

- repo: https://github.com/pre-commit/pre-commit-hooks
  sha: master
  hooks:
  - id: trailing-whitespace
    exclude: wargaming|bigworld|saber/(server|template|tools|transport|scripts/(common/(TemplateData|pydev|bwpydevd.py$)|surrogates))
  - id: check-merge-conflict
    exclude: wargaming|bigworld|saber/(server|template|tools|transport|scripts/(common/(TemplateData|pydev|bwpydevd.py$)|surrogates))
  - id: double-quote-string-fixer
    exclude: wargaming|bigworld|saber/(server|template|tools|transport|scripts/(common/(TemplateData|pydev|bwpydevd.py$)|surrogates))
  - id: end-of-file-fixer
    exclude: wargaming|bigworld|saber/(server|template|tools|transport|scripts/(common/(TemplateData|pydev|bwpydevd.py$)|surrogates))
  # - id: fix-encoding-pragma
  #   exclude: wargaming|bigworld|saber/(server|template|tools|transport|scripts/(common/(TemplateData|pydev|bwpydevd.py$)|surrogates))
  - id: check-xml
    exclude: wargaming|bigworld|saber/(tools|transport|scripts/(common/(TemplateData|pydev|bwpydevd.py$)|surrogates))
  - id: name-tests-test
    exclude: wargaming|bigworld|saber/(server|template|tools|transport|scripts/(common/(TemplateData|pydev|bwpydevd.py$)|surrogates))
  - id: flake8
    exclude: wargaming|bigworld|saber/(server|template|tools|transport|scripts/(common/(TemplateData|pydev|bwpydevd.py$|Transport/Generated)|surrogates))
  - id: debug-statements
    exclude: wargaming|bigworld|saber/(server|template|tools|transport|scripts/(common/(TemplateData|pydev|bwpydevd.py$)|surrogates))

• vagga
• maybe tox to test code against several python versions

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