Added configurable physics materials per asset in PhysX group in FBX Settings. (#1186)

- Added back the' Physics Materials from Asset' tick in the collider components.
- Made physics materials names case insensitive.
- Refactored how to gather material information from fbx and used the same code for exporter and physx groups.

Gems/PhysX/Code/Editor/MaterialIdWidget.cpp

@@ -15,12 +15,12 @@
 
 #include <AzFramework/Physics/PropertyTypes.h>
 
+#include <QString>
+
 namespace PhysX
 {
     namespace Editor
     {
-        static const char* const DefaultPhysicsMaterialLabel = "<Default Physics Material>";
-
         AZ::u32 MaterialIdWidget::GetHandlerName() const
         {
             return Physics::Edit::MaterialIdSelector;
@@ -74,7 +74,7 @@ namespace PhysX
 
             auto lockToDefault = [gui]()
             {
-                gui->addItem(DefaultPhysicsMaterialLabel);
+                gui->addItem(QLatin1String(Physics::DefaultPhysicsMaterialLabel.data(), Physics::DefaultPhysicsMaterialLabel.size()));
                 gui->setCurrentIndex(0);
                 return false;
             };
@@ -103,7 +103,7 @@ namespace PhysX
 
             // Add default physics material first
             m_libraryIds.push_back(Physics::MaterialId());
-            gui->addItem(DefaultPhysicsMaterialLabel);
+            gui->addItem(QLatin1String(Physics::DefaultPhysicsMaterialLabel.data(), Physics::DefaultPhysicsMaterialLabel.size()));
 
             for (const auto& material : materials)
             {