• Split into `entitlements` and `privacy` sections
• `entitlements` is an array of entitlement keys
• `privacy` is a dictionary mapping UsageDescription keys to their descriptions
Necessary to support switching between AltStore beta and public version.
Wraps private non-optional _usageDescription value in public accessor with optional return type to still treat it as “optional” value.
Before, appPermissions was one array containing all permissions of different types.
Now, we split entitlement and privacy permissions into separate “entitlements” and “privacy” child arrays.
