Adopt pathlib. Update version dependency on enstools and enstools-encoding.

enstools/compression/analyzer/AnalysisOptions.py

enstools/compression/analyzer/analyze_data_array.py

enstools/compression/analyzer/analyzer.py

enstools/compression/analyzer/analyzer_utils.py

enstools/compression/compressor.py

enstools/compression/emulation.py

enstools/compression/metrics.py

enstools/compression/pruner.py

setup.py

tests/test_cli.py