[MMO] External Accounts 2.3.4

Authorization via VK has been changed to VK ID
The domain for VK has been updated

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

Support XF 2.3.0
Min require XF 2.3.0 Beta 3