[MMO] External Accounts 2.3.2

Fix error Cannot assign null to property of type array

Add steam auth
Add connected account migration. Attention, use this tool with caution and check with the developer before using the actions, and do not forget to make a backup copy before use this tool

Refactoring

Support XF 2.3.0
Min require XF 2.3.0 Beta 3

Update twitch api
Update vk api
Minimum XF version 2.2.0

Update vk api
Add Apple service (thanks @Goodnightpanda)
Add Heroku
I also wanted to thank @Goodnightpanda for creating a test application for testing and developing a service for Apple. And thank him for testing the application.