GUACAMOLE-632: Merge dynamic JPEG/WebP quality scaling.
GUACAMOLE-632: Merge dynamic JPEG/WebP quality scaling.

glyptodon/guacamole-server,mike-jumper/incubator-guacamole-server,glyptodon/guacamole-server,glyptodon/guacamole-server,apache/guacamole-server,apache/guacamole-server,mike-jumper/incubator-guacamole-server,mike-jumper/incubator-guacamole-server,apache/guacamole-server,mike-jumper/incubator-guacamole-server