Update items: add itemer interface.
Add base for 'use' action. Update some item methods
Refactoring: move the code for JSON creating and initializing to utils module
Fix a bug with drag and drop just taken stuff
Add item class characteristics to artifacts
Update items

Add items class for various types of items. Add items use method.
Add item equip method and etc.
Add useItem request instead of use. Also add players UseItem
Add splitItem for summarize items (like food). Update dropItem (good logic)
update sql