Stability, improved logging and nightly docker builds

What's Changed

• Rename mqtt*.rs to home_assistant*.rs by @DennisOSRM in #40
• Add lib.rs to bundle re-usable parts of the implementation by @DennisOSRM in #41
• Drop dependency on clap crate by @DennisOSRM in #43
• Hide actual MQTT implementation behind trait+newtype by @DennisOSRM in #42
• Convert to workspace project by @DennisOSRM in #46
• Hide internal interfaces by @DennisOSRM in #48
• [SimpleMQTT] Publish time sent from inverter in human-readable form by @DennisOSRM in #47
• Print source code revision on startup by @DennisOSRM in #49
• Set qos by @DennisOSRM in #54
• Implement read/write timeout by @DennisOSRM in #57
• Don't filter logging output by @DennisOSRM in #58
• Unique client ids by @DennisOSRM in #59
• Support connecting to inverter by hostname by @DennisOSRM in #60
• Downgrade error to warning by @DennisOSRM in #62
• Fix order of magnitude for pv_port{1,2}_energy by @DennisOSRM in #63
• Improve error handling, Nightly build by @dominikandreas in #44
• Fix order of magnitude for pv_port{1,2}_daily_yield by @DennisOSRM in #64

Full Changelog: v0.2...v0.3

Many thanks to @dominikandreas for the contributions to this release