Add Tile16Editor module class skeleton

src/app/editor/modules/tile16_editor.cc

@@ -0,0 +1,7 @@
+
+#include "tile16_editor.h"
+
+absl::Status Tile16Editor::Update() {
+  // TODO: Implement the Update method for the Tile16Editor class.
+  return absl::OkStatus();
+}