Revert "Remove the old --model-menu flag"

This reverts commit 109de34e3b.

server.py

@@ -214,10 +214,28 @@ if __name__ == "__main__":
         if extension not in shared.args.extensions:
             shared.args.extensions.append(extension)
 
+    available_models = utils.get_available_models()
+
     # Model defined through --model
     if shared.args.model is not None:
         shared.model_name = shared.args.model
 
+    # Select the model from a command-line menu
+    elif shared.args.model_menu:
+        if len(available_models) == 0:
+            logger.error('No models are available! Please download at least one.')
+            sys.exit(0)
+        else:
+            print('The following models are available:\n')
+            for i, model in enumerate(available_models):
+                print(f'{i+1}. {model}')
+
+            print(f'\nWhich one do you want to load? 1-{len(available_models)}\n')
+            i = int(input()) - 1
+            print()
+
+        shared.model_name = available_models[i]
+
     # If any model has been selected, load it
     if shared.model_name != 'None':
         p = Path(shared.model_name)