Eccw-gui

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* Convert embedded documentation from pdf to epub.
Since early 2022, applications with embdded pdf are forbidden by
some Windows™ protections.
* Replace obsolescent `pkg_resources` by `importlib` package for
metadata introspection.

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* all metadatas are now really centralised in setup.cfg
* eccw_gui module is now exectuable with python's option -m
* update and clean graphical ressources
* better pip packaging
* sdist now really gets all sources
* bdist gets desktop installation without root rights on linux
* bdist gets scripts for manual post-installation on Windows
* automatize building of python code from Qt .ui and .qrc files
* automatize building of python distribution
* add CHANGELOG

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* asynchronize main app and plot window
* reflow keyboard shortcuts
* give numbers to parameters and associate them to shortcuts
* 'FX' for selection of parameter to compute
* 'Crtl+X' for edition of scalar version of parameter
* 'Crtl+Alt+X' for edition of range version of parameter
* give 'Crtl' shortcut to all buttons
* give 'Alt' shortcut to all checkbox and aditional lineEdits
* reflow position of parameters in calculator an plot apps :
* context on left (which is now a groupBox of chekables)
* friction in the middle
* fluids on right
* better display of results in calculator app
* changes in code:
* black formating,
* cleaning of useless code
* renamings for clarity and better physical meaning