Cohen3

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General:
- Remove `bbc` backend  (because bbc shutdown rss service)
- Implement PEP517 & PEP518 (`pyproject.toml` using `poetry`)
- Replace `Pipenv` for `Poetry`

Fixes:
- PkgResourcesDeprecationWarning: Parameters to load are deprecated (when loading plugin)

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General:
- implement gh-actions

Fixes:
- Specify the eventdispatcher version in setup.py
- Update twisted dependency to 19.2.1
- Pipenv's lock conflict

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Fixes:
- Fix SSDP datagram sending
- Fix `request.setHeader` values
- Fix urllib3 security vulnerability detected in version 1.23.2

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General:
- Introduce new events system (EventDispatcher) which replaces
louie/dispatcher
- Apply Python3's f-Strings
- Normalise simple and double quotes (defaults to single quotes)
- Add/enhance documentation
- Remove unneeded modules louie and dispatcher as well as the related tests

Fixes:
- Fix most of the warnings when building docs
- Fix error on "SUBSCRIBE" for some event calls
- Fix wrong encoding/decoding strings introduced in the initial python 3 migration
- Fix extra quotes for SSDPServer's methods: doNotify and doByeBye

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General:
- Refactor some backends using the new module backends.models
- Introduces new module: backends.models
- Add backends status to README
- Better and cleaner documentation
- Python 3's f-Strings for backends modules
- Upgraded dependency for requests package (fix vulnerability)
- Split into several files the sphinx's documentation
- Migrate reports from coverage to codecov

Fixes:
- Fix backend IRadioStore (ShoutCast Radio)
- Fix backend TEDStore
- Fix backend LolcatsStore
- Fix backend AppleTrailersStore
- Fix the parsing of the soap messages with encoding declared

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General:
- Reintroduces WebUI
- Improve documentation
- Whole new design for web server html visualization

Fixes:
- Fix Inotify events
- Fix test_dbus reactors conflict
- Fix some travis dependencies
- Fix wrong log level for init function of the log module