- Rename build.py to make.py because it conflicts with the build python package
- Use subparsers so its more clear what will happen

NOTES: Attention to all package maintainers, this changes how Gajim is build.
Please check README.md for more information.

Fixes #11789
Fixes #10662

- Switch to SQLAlchemy
- Split message data into dedicated tables
- Adapt all code to new models
- Add tables for replies and threads

- Remove all direct usage of libsoup and use the nbxmpp.http module instead

- Update README.md