Hunter pets will gain full experience while in group, instead of half experience.

Hunter pet experience may still require tuning, as it is not clear as to how
much experience a pet would gain, and if the gain was influenced by the hunters
level being e.g. larger or not.

Signed-off-by: Daniel S. Reichenbach <daniel@kogitoapp.com>
When consuming potions not usable by their class, characters will now receive a matching error message.

E.g. if a Warrior tries to consume a mana potion, an error will be sent.

Signed-off-by: Daniel S. Reichenbach <daniel@kogitoapp.com>