iOS metadata + alt-store source support
This change adds 2 features:
- better support for ingesting fastlane metadata of iOS apps. This includes the most important texts fields, screenshots and icons. (followup to !1426 (merged))
- Generating altstore-index.json an alstore compatible index file (aka source). Right now this index file is hard-coded to
en-US
locale.
Edited by Michael Pöhn