Update social media options - 2021

[Robert Lyon]

Older options need removing so we are looking at making the Social Profile system more generic so instead of hardcoding in things like
AIM, Yahoo messenger, Jabber etc. we can just provide a title and URL fields so people can add whatever social media they want

That way people can have new things like TikTok, SnapChat etc

As a first phase we will need to deal with the current ones by an upgrade step where any that don't have URL saved need to work out the full URL and then save that back to the database.

Later on we will then need to strip out all the old sub classes for these old options.

We also need to make sure the fetching of favicons via google works the same for social media as it does with allowed iframes.