Issue #24225: Within idlelib files, update idlelib module names.

This follows the previous patch that changed idlelib file names.
Class names that matched old module names are not changed.
Change idlelib imports in turtledemo.__main__.

Exception: config-extensions.def.  Previously, extension section
names, file names, and class names had to match.  Changing section
names would create cross-version conflicts in config-extensions.cfg
(user customizations).  Instead map old names to new file names
at point of import in editor.EditorWindow.load_extension.

Patch extensively tested with test_idle, idle_test.htest.py, a custom
import-all test, running IDLE in a console to catch messages,
and testing each menu item.  Based on a patch by Al Sweigart.

Lib/idlelib/run.py

@@ -7,15 +7,15 @@ import threading
 import queue
 import tkinter
 
-from idlelib import CallTips
-from idlelib import AutoComplete
+from idlelib import calltips
+from idlelib import autocomplete
 
-from idlelib import RemoteDebugger
-from idlelib import RemoteObjectBrowser
-from idlelib import StackViewer
+from idlelib import debugger_r
+from idlelib import debugobj_r
+from idlelib import stackviewer
 from idlelib import rpc
-from idlelib import PyShell
-from idlelib import IOBinding
+from idlelib import pyshell
+from idlelib import iomenu
 
 import __main__
 
@@ -32,7 +32,7 @@ def idle_showwarning_subproc(
     if file is None:
         file = sys.stderr
     try:
-        file.write(PyShell.idle_formatwarning(
+        file.write(pyshell.idle_formatwarning(
                 message, category, filename, lineno, line))
     except IOError:
         pass # the file (probably stderr) is invalid - this warning gets lost.
@@ -82,7 +82,7 @@ def main(del_exitfunc=False):
     MyHandler object.  That reference is saved as attribute rpchandler of the
     Executive instance.  The Executive methods have access to the reference and
     can pass it on to entities that they command
-    (e.g. RemoteDebugger.Debugger.start_debugger()).  The latter, in turn, can
+    (e.g. debugger_r.Debugger.start_debugger()).  The latter, in turn, can
     call MyHandler(SocketIO) register/unregister methods via the reference to
     register and unregister themselves.
 
@@ -204,7 +204,7 @@ def print_exception():
             tbe = traceback.extract_tb(tb)
             print('Traceback (most recent call last):', file=efile)
             exclude = ("run.py", "rpc.py", "threading.py", "queue.py",
-                       "RemoteDebugger.py", "bdb.py")
+                       "debugger_r.py", "bdb.py")
             cleanup_traceback(tbe, exclude)
             traceback.print_list(tbe, file=efile)
         lines = traceback.format_exception_only(typ, exc)
@@ -298,12 +298,12 @@ class MyHandler(rpc.RPCHandler):
         executive = Executive(self)
         self.register("exec", executive)
         self.console = self.get_remote_proxy("console")
-        sys.stdin = PyShell.PseudoInputFile(self.console, "stdin",
-                IOBinding.encoding)
-        sys.stdout = PyShell.PseudoOutputFile(self.console, "stdout",
-                IOBinding.encoding)
-        sys.stderr = PyShell.PseudoOutputFile(self.console, "stderr",
-                IOBinding.encoding)
+        sys.stdin = pyshell.PseudoInputFile(self.console, "stdin",
+                iomenu.encoding)
+        sys.stdout = pyshell.PseudoOutputFile(self.console, "stdout",
+                iomenu.encoding)
+        sys.stderr = pyshell.PseudoOutputFile(self.console, "stderr",
+                iomenu.encoding)
 
         sys.displayhook = rpc.displayhook
         # page help() text to shell.
@@ -339,8 +339,8 @@ class Executive(object):
     def __init__(self, rpchandler):
         self.rpchandler = rpchandler
         self.locals = __main__.__dict__
-        self.calltip = CallTips.CallTips()
-        self.autocomplete = AutoComplete.AutoComplete()
+        self.calltip = calltips.CallTips()
+        self.autocomplete = autocomplete.AutoComplete()
 
     def runcode(self, code):
         global interruptable
@@ -372,7 +372,7 @@ class Executive(object):
             thread.interrupt_main()
 
     def start_the_debugger(self, gui_adap_oid):
-        return RemoteDebugger.start_debugger(self.rpchandler, gui_adap_oid)
+        return debugger_r.start_debugger(self.rpchandler, gui_adap_oid)
 
     def stop_the_debugger(self, idb_adap_oid):
         "Unregister the Idb Adapter.  Link objects and Idb then subject to GC"
@@ -396,7 +396,7 @@ class Executive(object):
             tb = tb.tb_next
         sys.last_type = typ
         sys.last_value = val
-        item = StackViewer.StackTreeItem(flist, tb)
-        return RemoteObjectBrowser.remote_object_tree_item(item)
+        item = stackviewer.StackTreeItem(flist, tb)
+        return debugobj_r.remote_object_tree_item(item)
 
 capture_warnings(False)  # Make sure turned off; see issue 18081