Mqttwarn

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- Fix HTTP basic authentication for Python 3 in plugins for HTTP, XBMC and Ionic.
Thanks, sumnerboy12!

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- Attempt to fix README on Docker Hub

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- When title is not set in configuration settings, use ``mqttwarn: {topic}``
instead of ``mqttwarn`` only. Thanks, Rob!
- Add launch configuration for VSCode. Thanks, David!
- Use STDERR as default log target
- Stop including the "tests" folder into the sdist package
- Add "mqttwarn-contrib" package to the list of "extra" dependencies
- Improve launching service plugins interactively from the command line
Now, there are two options "--config" and "--options" to be able to
obtain all relevant bits of information from the command line.

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- Rename repository default branch to "main"
- Fix "http" service plugin
- Improve machinery to launch a notification service plugin standalone.
Now, it works without any ``mqttwarn.ini`` configuration file at all.
- Begin adding tests for services
- Drop official support for Python 2

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- [prowl] Update service plugin to use "pyprowl" instead of "prowlpy"
- [core] Make "functions" setting in configuration file optional
- [ci] Build and publish Docker multi-platform images

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- [ci] Run software tests and Docker image building on GitHub Actions (GHA)
- [ci] Publish Docker images to GitHub Container Registry (GHCR)