Merge pull request opencv#632 from asenyaev/asen/fix_current_builds

Defined ffmpeg version for MacOS and Windows Server version in Github Actions

Merge pull request opencv#628 from asenyaev/3.4

Update 3.4 branch with latest updates in master

Merge pull request opencv#598 from asenyaev/asen/4.5.5_release

Updated submodules to 4.5.5 release

Merge pull request opencv#597 from asenyaev/asen/3.4.17_release

Updated submodules to 3.4.17 release

Merge pull request opencv#579 from asenyaev/asen/fix_pylin_and_pycharm

Added lines for a proper work using pylint and an autocomplete in IDE

Merge pull request opencv#584 from asenyaev/asen/upgrade_3.4_again

Update 3.4 branch to the latest changes in master

Merge pull request opencv#568 from asenyaev/asen/remove_extra_modules…

…_3.4

Removed unused modules for 3.4 branch

Merge pull request opencv#561 from andruekonst/patch-1

Fix typo in Readme

Merge pull request opencv#500 from williamjacksn/upload-sdist-to-pypi

Include software distributions when uploading to PyPI

Merge pull request opencv#512 from asenyaev/3.4

Update 3.4 with master changes