refactoring of NT names

build.gradle

src/main/grammar/RelAstGrammar.bnf

...tadd/tooling/RelAstGrammarRefactoringSupportProvider.java

...main/java/org/jastadd/tooling/RelAstGrammarReference.java

...rg/jastadd/tooling/RelAstGrammarReferenceContributor.java

.../org/jastadd/tooling/psi/RelAstGrammarElementFactory.java

...va/org/jastadd/tooling/psi/RelAstGrammarNamedElement.java

...dd/tooling/psi/RelAstGrammarTypeReferenceManipulator.java

...stadd/tooling/psi/impl/RelAstGrammarNamedElementImpl.java

...rg/jastadd/tooling/psi/impl/RelAstGrammarPsiImplUtil.java

src/main/resources/META-INF/plugin.xml