SmrPlayer: additional condition for canFight
SmrPlayer: additional condition for canFight

* The `canFight` method will now also return false if the player
  is on a planet.

* Add documentation for the method.

hemberger/smr,smrealms/smr,smrealms/smr,hemberger/smr,smrealms/smr,hemberger/smr,hemberger/smr