Improve Item Unstack System on Hive

[tdauth]

https://www.hiveworkshop.com/threads/barad%C3%A9s-item-unstack-system-1-0.339109/

Improvements:

• Shorter text which fits in one line.
• Example with dynamically customized item.
• GUI and vJass versions.
• No map script but a trigger.

[tdauth]

Done. We don't need a vJass or GUI version.