refactor: update Puppet transform logic to support AffineTransform world matrices and improve selection highlighting

src/Math/Assembly.h

@@ -43,9 +43,9 @@ namespace uLib {
  * A bounding box is automatically computed from all contained objects and
  * can be queried or shown/hidden through the VTK puppet.
  */
-class Assembly : public ObjectsContext, public AffineTransform {
+class Assembly : public ObjectsContext, public TRS {
 public:
-    uLibTypeMacro(Assembly, ObjectsContext, AffineTransform)
+    uLibTypeMacro(Assembly, ObjectsContext, TRS)
     virtual const char *GetClassName() const override { return "Assembly"; }
 
     Assembly();
@@ -54,7 +54,7 @@ public:
 
     template <class ArchiveT>
     void serialize(ArchiveT & ar, const unsigned int version) {
-        ar & boost::serialization::make_nvp("AffineTransform", boost::serialization::base_object<AffineTransform>(*this));
+        ar & boost::serialization::make_nvp("TRS", boost::serialization::base_object<TRS>(*this));
         ar & boost::serialization::make_hrp("GroupSelection", m_GroupSelection);
     }