Pylibjpeg-openjpeg

* Fix being unable to build from source using PyPI package
* Adds wheels for Python 3.10
* Reduces the amount of packaged openjpeg source code

* Re-add support for Python 3.6

* Fix incorrect decode of subsampled data
* Remove support for Python 3.6 and add it for Python 3.9

* Fixed incorrect returned values for signed data when the precision is less than a round number of bytes

Initial release

* Add support for decoding JPEG 2000 images