Migrate entity-related codegen to ProtoData

[alexander-yevsyukov]

This PR initiates the migration of codegen processing to ProtoData. The main part of this PR is the migration of codegen of Column classes in messages that implement the EntityState interface.

In details

EntityPlugin was introduced as an umbrella for all codgen operations related to EntityState messages.

The plugin is based on EntityDiscoveryProcess, which transforms TypeDiscovered event to EntityStateDiscovered event, if the discovered message type has appropriate options. Other parts of the EntityPlugin would listen to the event and act accordingly.

The first render of the plugin is ColumnRenderer which renders a public static class Column nested under corresponding message type implementing EntityState.

ColumnRenderer and ColumnClassFactory now do what ColumnGen class used to do. The ColumnGen class was deprecated and is no longer added to protoc plugin of McJava.

Other notable changes

• CodegenOptionsConfig class was renamed to MessageCodegenOptions.
• MessageGroupConfig class was renamed to ConfigWithFields.
• File name pattern patterns are no longer supported for signifying custom types of messages. Please use mixin interfaces or custom code generation.
• Validation runtime dependency is added to a project to which McJava applied anyway, because generated code implements ValidatableMessage even if Validation codegen is turned off, and we want new run-time validation being available anyway.
• Extensions recently moved to base and tool-base were applied.
• Improved filtering for the mc-java-plugin-bundle artifact.

[alexander-yevsyukov]

@armiol, just FYI. It finally builds again.

“Getting better, every day...” :)