Display sender avatar from a libravatar server

 This plugin for the Claws Mail mailer allows retrieval of profile
 images from libravatar servers, either federated servers (running
 on sender's domain) or the main libravatar.org server.
 .
 Currently supports all default missing icon modes on libravatar.org
 service, and makes extensive use of disk caching to minimize the
 number of network requests.
 .
 Nevertheless, it may add several network requests per message, so
 if you're on a high latency network you may experience some delay
 displaying messages.