avro

AVRO-3239: IDL parsing silently ignores dangling documentation comments (#1377)

* AVRO-3239: Add warnings for ignored doc comments

* AVRO-3239: Add mock Maven Log implementation

* AVRO-3239: Log parser warnings in Maven IDL mojo

* AVRO-3239: Log parser warnings in the IDL tools

* AVRO-3239: Document new (public) parser method

* AVRO-3239: Undo merge error and fix build

* AVRO-3239: Extract helper class for doc comments

The helper class allows better testing of and documentation for handling
doc comments. The .avpr changes all dedented comments.

* AVRO-3239: Add missing license

* AVRO-3239: Fix documentation comment

* AVRO-3239: Fix tests

* AVRO-3239: Apply review comments