* Build on JDK 8 and 17 as well as 11.
* Remove JDK 8 for now.
`DefaultDateTypeAdapterTest` fails.
* Tweak javadoc to avoid warnings.
Mostly these are about using `<h3>` when the previous tag was `<h1>`,
and the like. This previous tag might be implicit (part of what javadoc
itself outputs rather than the HTML in doc comments).
Apparently JDK 11 puts method javadoc inside `<h2>` while JDK 11 puts it
inside `<h3>`. Or something like that. Anyway it doesn't appear to be
possible to use `<h3>` _or_ `<h4>` and please both.
* Add CodeQL GitHub code scanning workflow
* Only compile main sources for code scanning
* Move test .proto files to test sources
`annotations.proto` also seems to be only relevant for tests because the test
explicitly registers them as extensions. By default the Proto adapter does not
consider them.
* Address some code scanning findings
* Fix some more findings
* Put module-info.class into Multi-Release JAR folder
Uses ModiTect to place module-info.class under Multi-Release JAR folder
`META-INF/versions/9`.
* Adjust pom.xml to drop support for Java 6
* Change doclint setting
All Javadoc errors have been solved previously; doclint can now be enabled
without causing build failures.
* Improve README Java requirements
- Lets you customize the proto field name serialization per field
- Lets you use different cases for serialization (e.g. you could use UpperCamelCase for your proto field names and willing to serialize them using LowerHyphen)
- Lets you choose to serialize enum values with their value (0, 1, 2, ...) instead of their name.
