Revert "change CamelDesignerPlugin.java & CamelSpringUtil.java to scala."

This reverts commit fd067cd858ff665fd700975322375a55d8e43878.
Revert "Revert "change CamelDesignerPlugin.java & CamelSpringUtil.java to scala.""

This reverts commit d6a00106cc8ca9d27e76a09de6263c04905c025e.