Convert exec_ calls to exec and remove compat checks

Note: This change breaks support for Qt4 and older versions of Qt5.
exec_ was a reserved keyword in python 2, its not in python 3. PyQt6 has
dropped support for exec_ and its deprecated in PySide6. Modern Qt5 supports both.

This requires disabling py2-3 compatibility checking as modernize doesn't
like using `exec` as a object property.

I'm also removing the compileall check as it's assumed that the linting
flake8/black checks will cover checking for syntax errors.

Author: MHendricks

preditor/gui/dialog.py

@@ -134,7 +134,7 @@ def exec_(self):
         self.setAttribute(Qt.WidgetAttribute.WA_DeleteOnClose, False)
 
         # execute the dialog
-        return QDialog.exec_(self)
+        return super().exec()
 
     def setGeometry(self, *args):
         """

preditor/gui/drag_tab_bar.py

@@ -54,7 +54,7 @@ def mouseMoveEvent(self, event):  # noqa: N802
         drag.setHotSpot(event_pos - pos_in_tab)
         cursor = QCursor(Qt.CursorShape.OpenHandCursor)
         drag.setDragCursor(cursor.pixmap(), Qt.DropAction.MoveAction)
-        action = drag.exec_(Qt.DropAction.MoveAction)
+        action = drag.exec(Qt.DropAction.MoveAction)
         # If the user didn't successfully add this to a new tab widget, restore
         # the tab to the original location.
         if action == Qt.DropAction.IgnoreAction:

preditor/gui/loggerwindow.py

@@ -492,7 +492,7 @@ def setup_run_workbox(self):
 
     def openSetPreferredTextEditorDialog(self):
         dlg = SetTextEditorPathDialog(parent=self)
-        dlg.exec_()
+        dlg.exec()
 
     def focusToConsole(self):
         """Move focus to the console"""
@@ -875,7 +875,7 @@ def maybeDisplayDialog(self, dialog):
         if dialog.objectName() in self.dont_ask_again:
             return
 
-        dialog.exec_()
+        dialog.exec()
 
     def restartLogger(self):
         """Closes this PrEditor instance and starts a new process with the same