Moved non-ea stuff back to core.main (#19)

...approximative/density/ea/fitness/DensityBasedFitness.java

...voal/approximative/density/model/CustomKernelDensity.java

...ava/de/evoal/approximative/density/model/DensityData.java

...main/java/de/evoal/core/arff/io/ArffPropertiesReader.java

...ff/src/main/java/de/evoal/core/arff/main/ConvertArff.java

...re.ea/src/main/java/de/evoal/core/ea/api/cdi/Fitness.java

...src/main/java/de/evoal/core/ea/api/codec/CustomCodec.java

.../java/de/evoal/core/ea/api/initial/InitialPopulation.java

...in/java/de/evoal/core/ea/main/alterer/AltererFactory.java

.../core/ea/main/alterer/crossover/CorrelationCrossover.java

...a/main/alterer/crossover/CorrelationCrossoverMemento.java

...e/ea/main/alterer/crossover/LineCorrelationCrossover.java

...in/alterer/crossover/LineCorrelationCrossoverMemento.java

...ain/alterer/crossover/MultiPointCorrelationCrossover.java

...erer/crossover/MultiPointCorrelationCrossoverMemento.java

...terer/crossover/PartiallyMatchedCorrelationCrossover.java

...rossover/PartiallyMatchedCorrelationCrossoverMemento.java

...in/alterer/crossover/SinglePointCorrelationCrossover.java

...rer/crossover/SinglePointCorrelationCrossoverMemento.java

...a/main/alterer/crossover/UniformCorrelationCrossover.java