Add support for multiple IM-handles

[orjanj]

Add support for multiple IM handles (such as Twitch) on a users profile (suggestion by @mkberntsen).

Suggesting also adding Linkedin, Snapchat and/or even Facebook.
Open for suggestions as this should not be that big task to implement.

[mfyll]

This is already supported and they are easily added in the SQL database. All IM types are defined as types in the database, and the way to add more is to simply add the types there.