improve PyQt5.Qt compatibility

- support 'from PyQt5 import Qt' case
- alias it to aqt.qt modules instead of relying on getattr, so that
'from PyQt5.Qt import *' case works.

qt/aqt/qt/qt5_compat.py

@@ -401,6 +401,6 @@ PyQt6.QtCore.QRegExp = PyQt6.QtCore.QRegularExpression
 # Mock the removed PyQt5.Qt module
 ##########################################################################
 
-from . import qt5_qt_module
-
-sys.modules["PyQt5.Qt"] = qt5_qt_module
+sys.modules["PyQt5.Qt"] = sys.modules["aqt.qt"]
+# support 'from PyQt5 import Qt', as it's an alias to PyQt6
+PyQt6.Qt = sys.modules["aqt.qt"]

qt/aqt/qt/qt5_qt_module.py

@@ -1,16 +0,0 @@
-# Copyright: Ankitects Pty Ltd and contributors
-# License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
-
-# pylint: skip-file
-
-"""
-Compatibility shim for PyQt5.Qt
-"""
-
-from typing import Any
-
-
-def __getattr__(name: str) -> Any:
-    import aqt.qt
-
-    return getattr(aqt.qt, name)