Dependency on local encoding

The generated file charset is not set explicitly, so the file is encoded by user's charset. It should be set explicitly - I recommend UTF-8, it should be enough.

https://github.com/eclipse-ee4j/glassfish-hk2/blob/master/maven-plugins/hk2-inhabitant-generator/src/main/java/org/jvnet/hk2/generator/internal/GeneratorRunner.java#L346

We should check if there isn't more such issues.