Debug: Add sprite dump support to NewGRF objects

src/newgrf_object.cpp

@@ -566,3 +566,8 @@ void TriggerObjectAnimation(Object *o, ObjectAnimationTrigger trigger, const Obj
 		TriggerObjectTileAnimation(o, tile, trigger, spec);
 	}
 }
+
+void DumpObjectSpriteGroup(const ObjectSpec *spec, std::function<void(const char *)> print)
+{
+	DumpSpriteGroup(spec->grf_prop.spritegroup[0], std::move(print));
+}

src/table/newgrf_debug_data.h

@@ -837,6 +837,7 @@ static const NIVariable _niv_objects[] = {
 
 class NIHObject : public NIHelper {
 	bool IsInspectable(uint index) const override        { return ObjectSpec::GetByTile(index)->grf_prop.grffile != nullptr; }
+	bool ShowSpriteDumpButton(uint index) const override { return true; }
 	uint GetParent(uint index) const override            { return GetInspectWindowNumber(GSF_FAKE_TOWNS, Object::GetByTile(index)->town->index); }
 	const void *GetInstance(uint index)const override    { return Object::GetByTile(index); }
 	const void *GetSpec(uint index) const override       { return ObjectSpec::GetByTile(index); }
@@ -890,6 +891,12 @@ class NIHObject : public NIHelper {
 			}
 		}
 	}
+
+	/* virtual */ void SpriteDump(uint index, std::function<void(const char *)> print) const override
+	{
+		extern void DumpObjectSpriteGroup(const ObjectSpec *spec, std::function<void(const char *)> print);
+		DumpObjectSpriteGroup(ObjectSpec::GetByTile(index), std::move(print));
+	}
 };
 
 static const NIFeature _nif_object = {