Also show Powers tab when actor has power items
Currently, the Power tab on actor sheets gets shown if the actor 1. has a arcane background or 2. has a item granting powers. If you just add a power on an actor, it is hidden and you can't see it.
With this, the tab is also shown if the actor has any power-type items. Also see discussion in #1018.
Edited by Max Hilbrunner