Adding new commands to the material component for managing, removing, repairing material slots

• Adding commands to material component to clear or repair material slots
• Moved all clear and repair functions from the editor component to the material component controller, bound to its buses so they can be accessed from script
• Added new functions to clear model and LOD material groups
• Added function to remove material assignments with bad asset references
• Added function to reassign materials with bad asset references to the default asset
• Added function to remove material assignments that don’t match slots available on the active model. This case arises when switching between different models, changing the materials on a given model, or copying and pasting the material component to a different entity with a different model. The user might end up with hidden material slots that load assets but have no effect.
• Converted remaining code that iterated over editor material slots to instead use the material component request bus
• Removed functions from the editor material component that enumerated editor material slots

Signed-off-by: Guthrie Adams <guthadam@amazon.com>

Gems/AtomLyIntegration/CommonFeatures/Code/Source/Material/EditorMaterialComponentExporter.cpp

@@ -55,6 +55,10 @@ namespace AZ
 
             bool OpenExportDialog(ExportItemsContainer& exportItems)
             {
+                // Sort material entries so they are ordered by name in the table
+                AZStd::sort(exportItems.begin(), exportItems.end(),
+                    [](const auto& a, const auto& b) { return a.GetMaterialSlotName() < b.GetMaterialSlotName(); });
+
                 QWidget* activeWindow = nullptr;
                 AzToolsFramework::EditorWindowRequestBus::BroadcastResult(activeWindow, &AzToolsFramework::EditorWindowRequests::GetAppMainWindow);