Add artifacts table to db scheme
Add inserts into db of wonderful artifacts from Lord of the Rings
Add message and weight field to ItemKind struct
Move generate actors id func to utils module
Add to the monster generator information about map depth
Some change in drop probability
Add item structure

Now when the game starts, we obtain a list of all possible in-game items.
Create item generators according to the depth map.
Add additional item characteristics to the Item struct.
Create monsters drop. Also add range random func to utils
Drop monster item's after death
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