Clean up no-need files/ folders and refactoring directory structure

delete handling_data.py, handling_data_reftek.py, data_type_model.py, mseed/, waveform_processor.py, mseed_data/mseed_reader_helper.py, decimator.py, downsampler.py

move time_power_square related to time_power_square/; refactor unittest

assigned to @ldam

added 1 commit

• 64074aed - flake8

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• 30894a76 - flake8

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added 1 commit

• 40866bc2 - flake8

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requested review from @kienle

added 13 commits

• 40866bc2...11e66d84 - 12 commits from branch master
• 602eacff - Merge branch 'master' into clean_up_no_need_files_folders

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approved this merge request

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• 18336382 - remove docstring added when converting from slow reading to fast reading;...

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mentioned in commit 661b71b1

merged