include continuous (revolute) joints in efforts display

Discovered while exploring visualizations for the Kinova Gen3 arms,
where every second joint is continuous. The display only added
arrow indicators for the non-continuous joints.

Author: v4hn

src/rviz/default_plugin/effort_display.cpp

@@ -232,7 +232,7 @@ void EffortDisplay::load()
        it != robot_model_->joints_.end(); it++)
   {
     urdf::JointSharedPtr joint = it->second;
-    if (joint->type == urdf::Joint::REVOLUTE)
+    if (joint->type == urdf::Joint::REVOLUTE || joint->type == urdf::Joint::CONTINUOUS)
     {
       std::string joint_name = it->first;
       urdf::JointLimitsSharedPtr limit = joint->limits;
@@ -295,7 +295,7 @@ void EffortDisplay::processMessage(const sensor_msgs::JointState::ConstPtr& msg)
 
     const urdf::Joint* joint = robot_model_->getJoint(joint_name).get();
     int joint_type = joint->type;
-    if (joint_type == urdf::Joint::REVOLUTE)
+    if (joint_type == urdf::Joint::REVOLUTE || joint_type == urdf::Joint::CONTINUOUS)
     {
       std::string tf_frame_id = concat(tf_prefix_property_->getStdString(), joint->child_link_name);
       Ogre::Quaternion orientation;