Add an option to force quarternion to send NaNs

[knmcguire]

As discussed here in Crazyswarm2 latest PR, we would like to have an option to opt out of the quarternion sending, eventhough the MoCap sends something. In less ideal setups (like we have in our arena), the position is good but the orientation is buggy and we rather would like to use the internal orientation estimation.

I think this can be done with setting it in the config file and using this ifstatement in the code:

motion_capture_tracking/motion_capture_tracking/src/motion_capture_tracking_node.cpp

Line 250 in ef593e2

if (rigidBody.orientationAvailable()) {