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- added `is_additional_measure_producer` variable, `additional_measures` property and
`additional_measure(str)` method to the `weka.classifiers.Classifier` class,
giving convenient access to classes implementing `weka.core.AdditionalMeasureProducer`
- replaced javabridge with jpype behind the scenes, simplifying native API calls
- removed property `JavaObject.jclasswrapper`
- property `JavaObject.jwrapper` is now deprecated and `JavaObject.jobject` should be used instead
- renamed `JavaArray.new_instance` to `JavaArray.new_array`
- now works on M1/M2 Macs
- updated doc strings
- updated documentation, especially around installation