refactor model module

[shadow578]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 92.25806% with 12 lines in your changes are missing coverage. Please review.

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Files	Coverage Δ
custom_components/xmltv_epg/api.py	86.11% <100.00%> (ø)
custom_components/xmltv_epg/entity.py	100.00% <100.00%> (ø)
custom_components/xmltv_epg/model/__init__.py	100.00% <100.00%> (ø)
custom_components/xmltv_epg/model/helper.py	100.00% <100.00%> (ø)
custom_components/xmltv_epg/sensor.py	91.25% <100.00%> (ø)
test/conftest.py	100.00% <100.00%> (ø)
test/model/test_TVChannel.py	100.00% <100.00%> (ø)
test/model/test_TVGuide.py	100.00% <100.00%> (ø)
test/model/test_TVProgram.py	100.00% <100.00%> (ø)
test/test_config_flow.py	100.00% <100.00%> (ø)
... and 6 more