Move cmdline scripts into package so that they can be found

Add command line scripts normalise and combine

Buffer stdout and stderr output from the unit test runs

Use --trailing-comma with isort

Use multi-line imports.

Use colors for isort output

Move source code files to src/ folder

Remove the soundcard functionallity.

update the version to 0.7.0

replace setup.py with pyproject.toml

Remove third party dependency samplerate.

Remove the extra 'testing' target

Update plotting.

add bitrate calculation

flake8 style fix