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/afx/afxMagicMissile.h

@@ -69,7 +69,7 @@ public:
 public:
    // variables set in datablock definition:
    // Shape related
-   DECLARE_SHAPEASSET_REFACTOR(afxMagicMissileData, ProjectileShape)
+   AssetRef<ShapeAsset> projectileShapeAssetRef;
   //StringTableEntry      projectileShapeName;
 
   //bool                  hasLight;