net-im/toot: Update to 0.47.1

Use python-flavors.
Switch to manuall install method because there is no setup.py anymore.
Switch to DISTVERSION.
Submitter takes maintainership.

Changelogs:
https://github.com/ihabunek/toot/releases/tag/0.43.0
https://github.com/ihabunek/toot/releases/tag/0.44.0
https://github.com/ihabunek/toot/releases/tag/0.44.1
https://github.com/ihabunek/toot/releases/tag/0.45.0
https://github.com/ihabunek/toot/releases/tag/0.46.0
https://github.com/ihabunek/toot/releases/tag/0.47.0
https://github.com/ihabunek/toot/releases/tag/0.47.1

PR: 283634