Fix block/item game object creation and texture fallback

- Add GameObjectFactory: create actual Tile/TileItem/Item objects via PDB symbols
- Fix IdRegistry ID ranges: BLOCK_MOD_START=174, ITEM_MOD_START=3000
- Add icon parameter to item registration (API, NativeInterop, NativeExports)
- Use protected (IEAA/MEAA) decorated names for Tile/Item constructors
- Lazy-dereference Material/SoundType pointers (NULL until staticCtor runs)
- CrashHandler: skip __debugbreak() from game exe so missing texture fallback runs
- ExampleMod: add .Icon("ruby") to item registration

ExampleMod/ExampleMod.cs

@@ -26,6 +26,7 @@ public class ExampleMod : IMod
         Ruby = Registry.Item.Register("examplemod:ruby",
             new ItemProperties()
                 .MaxStackSize(64)
+                .Icon("ruby")
                 .InCreativeTab(CreativeTab.Materials));
 
         Registry.Recipe.AddFurnace("examplemod:ruby_ore", "examplemod:ruby", 1.0f);