[Client] Added 'user_image_url' in request while authenticating for plugin
[Server] Added 'image_url' field in 'User' model
[Client] Fixed minor bug
[Client] For plugin, authenticating again if pluginUserEmail and sqliteUserEmail aren't same
[Server] Sending 'user_image_url' in anno response to client
[Client] Showing userProfileImage instead of AppIcon in feed list for plugin
[Client] Added default user image for plugin