Refactor URDF and launch files for iiwa robot

- Updated gripper macros in gripper_macros.xacro to simplify parameters and add Gazebo support.
- Removed unused mesh property in gripper_meshes.xacro.
- Enhanced iiwa7 digital and FRI URDF files with simulation arguments and improved controller setup.
- Added new launch files for Gazebo simulation and universal launch configuration.
- Implemented YAML parameter wrapping for ROS2 in converter.py.
- Introduced a new gz_bridge.yaml configuration for Gazebo to ROS2 topic mapping.
- Cleaned up setting_loader.py and added necessary imports.

src/iiwa_bringup/launch/supported/iiwa_controllers.launch.py

@@ -33,7 +33,6 @@ def _setup_controllers(context, *args, **kwargs):
         ],
     )
 
-    
     joint_state_broadcaster_spawner = Node(
         package="controller_manager",
         executable="spawner",