v1.6.0: log labels, push/pull/notices CLI, shutdown exit codes

Notable new features

• feat: push client functionality and CLI command by @anpep in #147
• feat(logfwd): add log labels by @barrettj12 in #312
• feat: pull client functionality and CLI command by @anpep in #148
• feat(cli): add CLI commands for notices (notices, notice, notify) by @benhoyt in #298
• feat: make shutdown action return meaningful exit code by @benhoyt in #336

Other minor changes

• docs: add snapcraft badge to README by @jnsgruk in #328
• fix: allow local building and testing of the snap on PRs by @cjdcordeiro in #326
• fix(daemon): handle invalid notice types in filter by @olivercalder in #329
• docs(README.md): rm, push and pull are now implemented by @thp-canonical in #332
• docs: remove Roadmap/TODO section in README.md by @benhoyt in #334
• docs: add CI badges to README by @jnsgruk in #335
• feat(cli): implement personality for application name-agnostic help manuals by @anpep in #238
• feat(testutil): add ErrorIs and DeepUnsortedMatches checkers by @dmitry-lyfar in #331
• feat: add StateStarterUp to move expensive init ops to dedicated methods by @dmitry-lyfar in #330
• fix: snap release job run condition by @cjdcordeiro in #333
• fix(daemon): small refactor of notices api by @olivercalder in #337

New contributors

• @thp-canonical made their first contribution in #332
• @dmitry-lyfar made their first contribution in #331

Full Changelog: v1.5.0...v1.6.0