visualizer: implemented %N for display-name support in InvoVisualizer

Author: rhornig

src/inet/visualizer/base/InfoVisualizerBase.cc

@@ -23,6 +23,11 @@ std::string InfoVisualizerBase::DirectiveResolver::resolveDirective(char directi
     switch (directive) {
         case 'n':
             return module->getFullName();
+        case 'N': {
+            // display name (the alternative name shown on the GUI), or the full name if none is set
+            const char *displayName = module->getDisplayName();
+            return displayName != nullptr && *displayName != '\0' ? displayName : module->getFullName();
+        }
         case 'p':
             return module->getFullPath();
         case 't':

src/inet/visualizer/base/InfoVisualizerBase.ned

@@ -16,6 +16,7 @@ package inet.visualizer.base;
 //
 // The format string can contain the following directives:
 //  - %n module full name
+//  - %N module display name (the module full name if no display name is set)
 //  - %p module full path
 //  - %t display string text
 //  - %s `cModule`::str()