Add pose log topic. (#223)
Add pose log topic. (#223)

When enabled, /cf<id>/pose is published with the internal state estimate
from the on-board EKF. This is useful for on-board state estimators
(flow deck, lighthouse, LPS).

Authored-by: Wolfgang Hoenig <68202b20c70b3fb46aeae4691fdd3db6593e78b6@caltech.edu>
USC-ACTLab/crazyswarm,USC-ACTLab/crazyswarm,USC-ACTLab/crazyswarm,USC-ACTLab/crazyswarm