forpy 2

### - ~ -

- ~ClassificationError() : forpy::ClassificationError
- ~ForpyException() : forpy::ForpyException
- ~IDataProvider() : forpy::IDataProvider
- ~IDecider() : forpy::IDecider
- ~IEntropyFunction() : forpy::IEntropyFunction
- ~IGainCalculator() : forpy::IGainCalculator
- ~ILeaf() : forpy::ILeaf
- ~InducedEntropy() : forpy::InducedEntropy
- ~IThreshOpt() : forpy::IThreshOpt
- ~RenyiEntropy() : forpy::RenyiEntropy
- ~ShannonEntropy() : forpy::ShannonEntropy
- ~thread_pool() : forpy::threading::thread_pool
- ~ThreadControl() : forpy::ThreadControl
- ~TsallisEntropy() : forpy::TsallisEntropy