DUNE/Control/PathController: New reference timeout is now a parameter.
Config: auv/control: Added New Reference Timeout.
Merge remote-tracking branch 'origin/feature/pcontrol_reftimeout'

Feature #3152: The time to wait for a new DesiredPath reference is now
configurable via the parameter 'New Reference Timeout'. This new
parameter is present in all tasks that inherit from PathController and
has a default value of 5.0 seconds.

Authored by: João Fortuna
Reviewed by: Pedro Calado

This commit closes #3152.