Fix ADL lookup for cvf pdmToVariant/pdmFromVariant overloads

Move pdmToVariant/pdmFromVariant overloads for cvf::Color3f, Vec3d, Mat4d, and
Mat3d from namespace caf to namespace cvf. Templates in
cafInternalPdmFieldTypeSpecializations.h use "using caf::pdmToVariant" followed
by an unqualified call, so ADL searches the argument's namespace (cvf). With the
overloads only in caf, the default template was selected, causing cvf::Color3f to
be stored raw in a QVariant instead of as QColor — breaking color field editing
and producing QVariant::save warnings.

All call sites now use the unqualified "using caf::pdmXxx; pdmXxx(value)" pattern
so ADL finds the correct overload without depending on cvf:: as a visible prefix.
Add AdlVariantTest to cafPdmCoreColor3fTest.cpp that exercises this exact pattern.

Adds caf::toVariant<T> and caf::fromVariant<T> to cafPdmFieldTraits.h as
thin wrappers that encapsulate the ADL two-step internally. Client code can
now call caf::toVariant(x) directly instead of requiring a using-declaration
at every call site.

ApplicationLibCode/Commands/3dView/RicApplyUserDefinedCameraFeature.cpp

@@ -94,7 +94,7 @@ void RicApplyUserDefinedCameraFeature::readCameraFromSettings( cvf::Vec3d& eye,
     QVariant upVariant  = settings.value( RicStoreUserDefinedCameraFeature::upName() );
     if ( eyeVariant.isNull() || vrpVariant.isNull() || upVariant.isNull() ) return;
 
-    caf::pdmFromVariant( eyeVariant, eye );
-    caf::pdmFromVariant( vrpVariant, vrp );
-    caf::pdmFromVariant( upVariant, up );
+    caf::fromVariant( eyeVariant, eye );
+    caf::fromVariant( vrpVariant, vrp );
+    caf::fromVariant( upVariant, up );
 }

ApplicationLibCode/Commands/3dView/RicStoreUserDefinedCameraFeature.cpp

@@ -104,14 +104,9 @@ void RicStoreUserDefinedCameraFeature::onActionTriggered( bool isChecked )
 
         camera->toLookAt( &eye, &vrp, &up );
 
-        QVariant eyeVariant = caf::pdmToVariant( eye );
-        settings.setValue( RicStoreUserDefinedCameraFeature::eyeName(), eyeVariant );
-
-        QVariant vrpVariant = caf::pdmToVariant( vrp );
-        settings.setValue( RicStoreUserDefinedCameraFeature::viewReferencePointName(), vrpVariant );
-
-        QVariant upVariant = caf::pdmToVariant( up );
-        settings.setValue( RicStoreUserDefinedCameraFeature::upName(), upVariant );
+        settings.setValue( RicStoreUserDefinedCameraFeature::eyeName(), caf::toVariant( eye ) );
+        settings.setValue( RicStoreUserDefinedCameraFeature::viewReferencePointName(), caf::toVariant( vrp ) );
+        settings.setValue( RicStoreUserDefinedCameraFeature::upName(), caf::toVariant( up ) );
 
         RiuMainWindow::instance()->refreshViewActions();
     }

ApplicationLibCode/Commands/AnnotationCommands/RicTextAnnotation3dEditor.cpp

@@ -177,7 +177,7 @@ void RicTextAnnotation3dEditor::updatePoint( caf::PdmUiFieldHandle* uiField, con
 
     cvf::Vec3d domainPos   = dispXf->transformToDomainCoord( newPos );
     domainPos.z()          = -domainPos.z();
-    QVariant originVariant = caf::pdmToVariant( domainPos );
+    QVariant originVariant = caf::toVariant( domainPos );
 
     caf::PdmUiCommandSystemProxy::instance()->setUiValueToField( uiField, originVariant );
 }

ApplicationLibCode/Commands/WellPathCommands/PointTangentManipulator/RicPolylineTarget3dEditor.cpp

@@ -142,7 +142,7 @@ void RicPolylineTarget3dEditor::slotUpdated( const cvf::Vec3d& origin, const cvf
 
     cvf::Vec3d domainOrigin = dispXf->transformToDomainCoord( origin );
     domainOrigin.z()        = -domainOrigin.z();
-    QVariant originVariant  = caf::pdmToVariant( domainOrigin );
+    QVariant originVariant  = caf::toVariant( domainOrigin );
 
     caf::PdmUiCommandSystemProxy::instance()->setUiValueToField( target->targetPointUiCapability(), originVariant );
 }

ApplicationLibCode/ProjectDataModel/WellPath/RimWellPathGeometryDef.cpp

@@ -520,7 +520,7 @@ void RimWellPathGeometryDef::fieldChangedByUi( const caf::PdmFieldHandle* change
                               linkedDefs.end() );
 
             cvf::Vec3d oldPos;
-            caf::pdmFromVariant( oldValue, oldPos );
+            caf::fromVariant( oldValue, oldPos );
 
             auto delta = m_referencePointUtmXyd() - oldPos;