Re-organize directory structure (#4971)

See discussion in #2491

Co-authored-by: Ivan Levkivskyi <ilevkivskyi@dropbox.com>

stdlib/@python2/toaiff.pyi

@@ -0,0 +1,11 @@
+from pipes import Template
+from typing import Dict, List
+
+table: Dict[str, Template]
+t: Template
+uncompress: Template
+
+class error(Exception): ...
+
+def toaiff(filename: str) -> str: ...
+def _toaiff(filename: str, temps: List[str]) -> str: ...