message: chore: Remove ButtplugUpgradableMessage Trait
  We'll just handle this using from.
diff: @@ -105,8 +105,6 @@ pub trait ButtplugMessage: Send + Sync + Clone {
  }
  }
  -trait ButtplugUpgradableMessage: ButtplugMessage {
  - fn convert_to_current_spec_version(self) -> ButtplugMessageUnion;
  }
  pub trait ButtplugDeviceMessage: ButtplugMessage {
  