superwall/Superwall-iOS 4.15.0 on GitHub

Adds support for custom store products. This allows you to purchase products that are on stores outside of the App Store using the PurchaseController.
Adds formUnion override when unioning sets of Entitlement objects.

Fixes issue where test mode products had trial price data missing.
Fixed computed period prices (weeklyPrice, dailyPrice, monthlyPrice, yearlyPrice) displaying incorrectly rounded values on StoreKit 2 in production. For example, a £4.99/week product could show as £5.00/week. This was caused by Apple's priceFormatStyle applying storefront-specific rounding to computed values.