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Backward-incompatible changes

* 174 ffmpeg now generates output params with output stream index (`-c:v:0 libx264 -c:v:1 libx265`)
* 168 drop python-3.6 support from pypi package

Other changes

* 150 upgrade funcparserlib
* 165 versioning compatible with PEP-440 in setup.py
* 169 fix new mypy errors
* 171 add python-3.11 to CI
* 152 upgrade pymediainfo to 6.x
* 162 update sphinx to 7.x

137 Always use stream number specifier in graph

BREAKING CHANGE:

Now instead of all audio streams, connecting source stream to a codec directly will produce only first audio stream, instead of all of them.

136 fix incorrect copy codec behavior

132 SIMD codec disconnection

131 copy codec implementation

123 fix concat frames count