Re-organize directory structure (#4971)

See discussion in #2491

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

stdlib/tkinter/scrolledtext.pyi

@@ -0,0 +1,8 @@
+from tkinter import Frame, Grid, Misc, Pack, Place, Scrollbar, Text
+from typing import Any, Optional
+
+# The methods from Pack, Place, and Grid are dynamically added over the parent's impls
+class ScrolledText(Text):
+    frame: Frame
+    vbar: Scrollbar
+    def __init__(self, master: Optional[Misc] = ..., **kwargs: Any) -> None: ...