Enable Translation classes to signal when settings have changed substantially

RenderableTrail listens to those changes and recomputes the trail if Translation settings have changed
Minor GUI improvements
Remove try/catch block from SpiceRotation
Update Ghoul reference

modules/base/rendering/renderabletrail.cpp

@@ -143,6 +143,7 @@ RenderableTrail::RenderableTrail(const ghoul::Dictionary& dictionary)
     _translation = std::unique_ptr<Translation>(Translation::createFromDictionary(
         dictionary.value<ghoul::Dictionary>(KeyTranslation)
     ));
+    addPropertySubOwner(_translation.get());
 
     _lineColor = dictionary.value<glm::vec3>(KeyColor);
     addProperty(_lineColor);