Cleans up ShapeAsset of some unnecessary/redundant elements like extra material and animations tracking

Removed the old SHAPE_ASSET macros
Implements AssetRef struct that acts as a universal wrapper for an templated AssetPtr and AssetId pair
Adds Type handling for AssetRef for ShapeAsset to unify handling in classes that utilize a shapeAsset, so assigning an assetPtr or an assetId will keep a record of the assignment in the event the assetPtr is invalid.
Update all classes that utilized the old SHAPE_ASSET macros to utilize the AssetRef struct and updated the class code to utilize it to provide much more clean and concise code that isn't blocked behind macro definitions
Added a new example class: shapeDatablockExample which allows render of a simple shape object utilizing a simple example datablock.

Engine/source/T3D/vehicles/hoverVehicle.cpp

@@ -332,9 +332,12 @@ bool HoverVehicleData::preload(bool server, String &errorStr)
          return false;
       }
    }
+
+   Resource<TSShape> shape = shapeAssetRef.assetPtr->getShapeResource();
+
    // Resolve jet nodes
    for (S32 j = 0; j < MaxJetNodes; j++)
-      jetNode[j] = getShape()->findNode(sJetNode[j]);
+      jetNode[j] = shape->findNode(sJetNode[j]);
 
    return true;
 }