Leagues VI Changes

This update separated shop stocks at Durrik's Goods.

It also fixed a cannon retrieval issue tied to buying more parts from Nulodion.

Durrik's Goods now has separate stocks for Ironmen and main accounts. The source does not identify the individual shop items covered by this change.

Buying more cannon parts from Nulodion no longer prevents picking up a cannon that was already set up. No precise cannon-part item IDs were supplied.