message: Use packed `Sprite::color` in Structure
  Removes references to the unpacked `Sprite::color` overload.
diff: @@ -85,7 +85,7 @@ Structure::~Structure()
  void Structure::disable(DisabledReason reason)
  {
  sprite().pause();
  - sprite().color(255, 0, 0, 185);
  + sprite().color(NAS2D::Color{255, 0, 0, 185});
  state(DISABLED);
  mDisabledReason = reason;
  mIdleReason = IDLE_NONE;
  @@ -105,7 +105,7 @@ void Structure::enable()
  }
  sprite().resume();
  - sprite().color(255, 255, 255, 255);
  + sprite().color(NAS2D::Color{255, 255, 255, 255});
  state(OPERATIONAL);
  mDisabledReason = DISABLED_NONE;
  mIdleReason = IDLE_NONE;
  @@ -123,7 +123,7 @@ void Structure::idle(IdleReason reason)
  }
  sprite().pause();
  - sprite().color(255, 255, 255, 185);
  + sprite().color(NAS2D::Color{255, 255, 255, 185});
  mDisabledReason = DISABLED_NONE;
  mIdleReason = reason;
  state(IDLE);
  