Rename market items map to packs map
- when getting price, check if item is a virtual or market item
- add setPurchaseType
- getting platform IDs pulled up to base model
Add isMarketPurchaseType
Set virutal good's price conditionally according to whether its purchase type is virtualItem or market
When getting item price, check if it's an item market or not, and return appropriate price

Conflicts:

	src/js/economy-models.js
Merge branch 'realMoney' into dev