On shutterOpenChanged callback

[nicost]

This PR lets Device Adapters inform the Core that the state of the shutter they control has changed. It should be called from code that monitors the state of the shutter. It would also be possible to call from code opening the shutter, but then you should make sure the shutter is really in the state reported (many shutters need some time to open / close).

This PR updated the Device interface version as well as the minor version of the Core. I am fine waiting to merge this PR until there are other reasons to increase the Device Interface version (as there are still a number of 3dparty device adpa\apters that we can not automatically update). @tlambert03

[Copilot]

Pull Request Overview

This PR adds a new callback mechanism to inform the Core when a shutter's open/closed state changes. Device adapters can now call OnShutterOpenChanged to notify the Core about shutter state transitions, enabling better monitoring and synchronization of shutter operations.

• Introduces OnShutterOpenChanged callback in the device interface and core system
• Updates device interface version from 73 to 74 and core minor version from 9 to 10
• Implements the callback in existing shutter device adapters (MultiShutter, DAShutter, DemoShutter)

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
MMDevice/MMDevice.h	Adds OnShutterOpenChanged method to device interface and increments version
MMCore/MMEventCallback.h	Adds onShutterOpenChanged virtual method for external callbacks
MMCore/MMCore.cpp	Updates core minor version number
MMCore/CoreCallback.h	Declares OnShutterOpenChanged method in CoreCallback class
MMCore/CoreCallback.cpp	Implements OnShutterOpenChanged handler to forward events to external callbacks
DeviceAdapters/Utilities/MultiShutter.cpp	Adds callback invocation when shutter state changes
DeviceAdapters/Utilities/DAShutter.cpp	Adds callback invocation with error handling
DeviceAdapters/DemoCamera/DemoCamera.h	Adds callback invocation in DemoShutter SetOpen method
DeviceAdapters/DemoCamera/DemoCamera.cpp	Initializes member variables and adds callback in OnState method

[marktsuchida]

LGTM provided that this is for best-effort UI updates only (not for timing or control) -- which is probably the case for most of our existing change notifications.

Will wait to merge in case @tlambert03 has any comments.

[nicost]

Did you have a chance to look at the @tlambert03 ? OK to merge?

[tlambert03]

sorry for the delay! Thanks for the ping. I'm totally fine/happy with virtual void onShutterOpenChanged(const char* name, bool open)

[marktsuchida]

Thanks. I'll try to merge this (hopefully today or tomorrow), probably together with one or two items from #642.