Support JPMS

[Mechite]

Just taking a quick look at this repository, it seems like

• there is no support for JPMS at all
• the project builds with Java 8, disallowing an explicit module-info

This can be solved by either:

• providing an Automatic-Module-Name in the manifest (easy 'quick fix', and good if we cannot maintain a module-info if new changes break it)
• utilizing a multi-release JAR to fully support JPMS and integrate fully
  • providing a source directory containing a module-info.java to maintain, e.g. at src/main/java9
  • configuring build with multi release with Gradle
• utilizing Moditect (likely unnecessary in this case)