C++ interface rename refactoring

Implemenent Refactoring for "interface rename" for C++ languages.

This does not imply any file/directory changes.

• Find function definition/declaration (check QtCreator locator "hortcut m" implementation)
• Set cursor to the class name/parameter / generate TextDocumentPositionParams
• Create QList<Core::SearchResultItem>
• Call SymbolSupport::applyRename()
• Remove old code for showing the issue (note for the user).