deprecate bool type to show_preview and preview; add logging related to change in behavior of None & False

Signed-off-by: Asadullah Shaikh <asadshaikh20022002@gmail.com>

Author: pantheraleo-7

picamera2/picamera2.py

@@ -596,7 +596,18 @@ def start_preview(self, preview=None, **kwargs) -> None:
         Additional keyword arguments may be supplied which will be
         forwarded to the preview class constructor.
         """
+        if isinstance(preview, bool):
+            _log.info("CHANGED: Passing False to show_preview or preview skips starting an event loop")
+            _log.warning("Passing bool type to show_preview or preview has been deprecated")
+            if preview:
+                _log.warning("Use Preview.auto() to autodetect")
+                preview = Preview.auto()
+            else:
+                _log.warning("Use Preview.NO to skip starting an event loop")
+                preview = Preview.NO
+
         if preview is None:
+            _log.info("CHANGED: Passing None (default) to show_preview or preview starts a NullPreview")
             preview = NullPreview(**kwargs)
         elif isinstance(preview, Preview):
             if preview is Preview.NO: