Moved all the logic out of the template into a separate endpoint. This
makes it easy to extend to also support images from different sources
like LDAP/SAML/OIDC. Session-based caching is hard to do, so to allow
time-based caching in the browser, the url needs to be unique for every
user by using a query parameter.
Replaced the default/fallback user image with a new one. It is based on
the old one, but does not need css to be visible. And removed said css.
Gravatar has now its own setting named `gravatar_enabled`, which is
disabled by default.
Previously strings with characters like "ß" would throw and exception
This seems to happen because the lib behind encode().decode('idna')
cant handle characters like this
The new setting 'verify_ssl_connections' tells the requests library to
verify secured outgoing HTTP connections.
Usually verifying is desired and helps to reveal configuration
problems. It also disables an ugly warning when HTTPS connections
are made without verification.
