[integrations,core] Add database support so remote messages are stored and can be used to reply to them
[core] Somehow find a way to get your user ID by token
[core] Maybe get rid of `main.list` field and create one automatically on a startup?
[integrations] Add support for shellscript integration
[integrations] Add formatting option
[integrations] Add filters
[integrations,vk] Add VK integration