Feat/Multi-Asset Rarity Types (eip-1155 like)

[JackBekket]

90

• changed buying mechanism to work with file order for limited type of token (multy-asset)
• changed rarity types to "Unlimited, Limited, Unique"

Unlimited is for cases where author sells copies of his work

Limited is for cases, where author is completely crazy dude with AI and a few thousands of something and he want to sell this out as soon (and cheap!) as possible

Unique is for cases where author sell something unique directly

• There are no more possible to buy a few nft's by one tx, we are simplifying this thing, one buyItem call -- one bought.

[JackBekket]

Check out and merge this please