jbock 5.0

• Changed the maven group name to io.github.jbock-java
• Renamed the artifacts: "jbock-annotations" -> "jbock" (aka "core"), "jbock" -> "jbock-compiler".
• moved the Either library into core
• add runtime model of the annotated class (net.jbock.model.CommandModel)
• parse now returns an Either
• rename the generated class, "*_Parser" -> "*Parser"
• SuperCommand is now an attribute
• add the atFileExpansion attribute
• add the unixClustering attribute
• runtime config, like terminalWidth, works differently (see implementation of parseOrExit)