Overhaul Author Profile handling.

This does a few things:
1. It reworks author profiles so they are more "independant artist in the internet age"-friendly, by adding
things like multiple possible contacts, home page contact, suggestions for the author role and changing the
full name section to "nick name".
2. It removes the automated KUser default author profile to avoid leaking.
3. It puts the author info into  new resources folder, named "authorinfo". This way, this information does
not get deleted when deleting the kritarc file.

Differential revision: https://phabricator.kde.org/D7076
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