1) Added a configurable message to Messages.yml when a player is spam fishing.

2) Added the ability to whitelist ALL items in the GroupStack[] list by adding an * to the list. This will allow overstacking of ANY item for ANY player who has the "illegalstack.overstack" permission. Useful for admins looking to create multiple copies of multiple items.

To enable this feature in game use:
/istack value add AllowStackForGroup *