Patch 10th of June -17

[GM NollKoll]

- Added some event related items/mobiles
- Finally serialized the empty venom vials, sorry to those that lost em during a server restart.
- Updates to vendors, reduce cache size and hopefully less lag.
- Spell cast bar module update
- Fix an internal item leak for vendor purchase processing.
- Core vendor purchase processing overflow protection.
- Aquarium, Fish Bowl and Fish optimisations.
- Various timer-based optimisations (reduce running timers by hundreds)
- Updates for vendor display caching.