Provide Trajectory Visualization in Gazebo

[xwavex]

The aim is to have a Gazebo plugin that "draws" a trajectory into the 3d scene.

• [x] ¿How does the interface look like?

• Should take a list of links from different models and draw multiple lines

• Should be able to clear the current view

• Should enable batch and incremental mode

• [x] ¿How does the communication look like?

• Should be stand-alone and working via the tools shipped with Gazebo.

• Should be available from within an Orocos environment

[xwavex]

Makes use of the ignition transport.

[xwavex]

Thread sync updated