Add Cirrus CI (#7431)
* Cirrus: Add Tox task
* Cirrus: Add Locale task
* Cirrus: Add Flake8 Task
* Cirrus: Add Regtest task
* Regtest: Flush stdout
Allows viewing output sooner.
* Regtest: Read process.stdout in text mode
Improves ability to quickly see output.
* Cirrus: Add Windows task
* Cirrus: Add Android task
* Cirrus: Add macOS task
* Cirrus: Add AppImage task
* Cirrus: Add tarball task
* Cirrus: Add Submodules task
* Android: remove superfluous cp/rm
* Add .dockerignore
Symlink to .gitignore.
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JeremyRand