Resolve "Renaming of Nonterminal Does Not Rename All Occurences"

Closes #1 (closed)

src/main/grammar/Grammar.bnf

@@ -22,7 +22,7 @@ comment ::= (WHITESPACE | MULTILINECOMMENT | DOCCOMMENT | SINGLELINECOMMENT)
 type_decl ::= ABSTRACT? declared_name (COL type_reference)? (ASSIGN (component | nta_component)*)? SCOL
 {
   extends="org.jastadd.tooling.grammar.psi.impl.GrammarTypeDeclImplExtension"
-  implements="org.jastadd.tooling.grammar.psi.GrammarTypeDeclExtension"
+  implements="org.jastadd.tooling.grammar.psi.GrammarNamedElement"
 }
 
 nta_component ::= SLASH component SLASH
@@ -46,7 +46,7 @@ declared_name ::= ID
 type_reference ::= ID
 {
   extends="org.jastadd.tooling.grammar.psi.impl.GrammarTypeReferenceImplExtension"
-  implements="org.jastadd.tooling.grammar.psi.GrammarTypeReferenceExtension"
+  implements="org.jastadd.tooling.grammar.psi.GrammarNamedElement"
 }
 
 java_name ::= ID