Laim

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Removed
- Debian packages for buster.

Added
- Debian packages for bookworm.

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Changed
- Debian packaging has been refactored to use native debian dependencies instead of dh-virtualenv.
Handlers that need to install dependencies should install these as regular system packages instead
of using the venv pip binary to install them.

Added
- ./tools/build_deb.sh now also builds packages for Debian Bullseye.
- Include both raw and undecoded subject in the message logs.

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Added
- More log details if the handler fails to process a message.

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Removed
- Support for python 3.5.

Changed
- Handlers can now return a dict to add fields to what is logged by the base handler.

Added
- Added the blinker signal `laim.before_log` to listen to logging events.

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Fixed
- Actually fix the pip issue that was thought fixed in 0.7.0.

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Changed
- The license was changed from MIT to the Hippocratic license to deny use that infringes on the UNs
declaration of human rights.

Fixed
- The pip in the installed virtualenv was unusable on buster due to a missing dependency in the
debian package.