Yasmin_msgs License Issue

[johnsonTyler0511]

Hi,

Thank you for creating this package. I have been impressed with what I have tested so far and my team and I are interested in using the visualizer for real-time introspection of a state machine. However even the msgs are under GPL license so we cannot link them in our proprietary code.

Is it possible to just release the yasmin_msgs package under a different license, We would prefer Apache-2, BSD or MIT license ?

Similar to this issue https://github.com/uleroboticsgroup/yasmin/issues/42