Implement manual squadron transfers.

Lightly tested but seems to work fine.

https://github.com/dcs-liberation/dcs_liberation/issues/1145

qt_ui/errorreporter.py

@@ -0,0 +1,17 @@
+import logging
+from collections import Iterator
+from contextlib import contextmanager
+from typing import Type
+
+from PySide2.QtWidgets import QDialog, QMessageBox
+
+
+@contextmanager
+def report_errors(
+    title: str, parent: QDialog, error_type: Type[Exception] = Exception
+) -> Iterator[None]:
+    try:
+        yield
+    except error_type as ex:
+        logging.exception(title)
+        QMessageBox().critical(parent, title, str(ex), QMessageBox.Ok)