"org.eclipse.gtm.modisco.java.emf.classic" provides an alternate emf classic implementation for metamodel Java (EObjectImpl use)

If ecore definition from "org.eclipse.gtm.modisco.java" is modified, please follow the steps to regenerate this alternate implementation :

- paste the new .ecore definition 
- fix the EPackage nsURI in .Ecore with : "http://www.eclipse.org/MoDisco/Java/x.x.x/java-classicEObject"
- launch "generate model" on .genmodel
- delete interfaces package (reuse those from "org.eclipse.gtm.modisco.java")
- modify extends of JavaFactory to extend org.eclipse.modisco.java.emf.JavaFactory
- modify extends of JavaPackage to extend org.eclipse.modisco.java.emf.JavaPackage