Remove Lombok from the code

Lombok has some nice features, but it isn't really Java. To achieve the things it does, it messes with compiler internals, which can and does lead to compatibility problems when switching or upgrading the Java compiler.

This has already caused problems for us when trying to switch to the Eclipse compiler (with its nice incremental compilation) combined with the Eclipse compiler's Groovy support and also with javac when Java 8 was new.

For instance, @lombok.Delegate has been deprecated and marked experimental and "support for this feature may be dropped if future versions of javac or ecj make it difficult to continue to maintain the feature": https://projectlombok.org/features/experimental/Delegate.html

We should switch to an alternative (eg Jackdaw, Immutables, AutoValue) where it makes sense, and simply Delombok the code where there is no practical alternative (eg @Slf4j).

• https://github.com/vbauer/jackdaw
• http://immutables.github.io/
• https://github.com/google/auto/tree/master/value
• https://projectlombok.org/features/delombok.html