New Features

• Added ci metadata to the indra extension. This can be automatically configured for GitHub and GitLab projects.
• Added gpl3OnlyLicense licensing option.
• Only sign jars when publishing a release, or the forceSign Gradle property is set.

Bugs Fixed

• Corrected handling of snapshot versions in projects where the snapshot is only a part of the version -- for example when build metadata is used.
• Fixed compiler argument handling to allow others (cough IntelliJ) to access compiler arguments at configuration time.