cleanup outdated jaxb annotations

[eheimbuch]

Proposed changes

Cleanup outdated jaxb annotations and cleanup some classes in general.

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[pfeuffer]

This change substitues manual equals and hashCode methods with lombok annotations. The way this is done does not include properties from super classes. Some classes extend BasicPropertiesAware with properties, which would not be included. We should remove this deprecated class first, but this has other implications, because the properties are used in the hg plugin.

[pfeuffer]

Fixes #1139 , too