The device may need to stop because it is about to restart with new
settings.

e.g. When the DemoRunner is started while the microphone is set to
44.1KHz and the speakers are set to 48KHz in Audio MIDI Settings, one of
the devices must be restarted in order for the AudioDeviceCombiner to
work. In this situation, stopping one device shouldn't count as an
error, because the device will be started again with new, compatible,
settings.

- The LV2 bundle rather than the executable was incorrectly be signed

Users reported this caused missed deadlines and performance penalties

We avoid modifying window controls in modal situations if possible.
Doing as much as [window setStyleMask: [window styleMask]]; for a
PopupMenu window will make it invisible on MacOS when the plugin is
hosted in an external subprocess.

This fixes a regression caused by
fb14118771.

The old API only allowed cancelling property "get" inquiries and
subscription updates. However, there are use-cases for cancelling other
requests too. e.g. switching between views in a JUCE app might mean that
it's no longer necessary to subscribe to a particular property.

Cancelling subscriptions ends up being quite involved. Different
handling is needed depending on whether the subscription is cancelled
before or after the responder replies to the initial request.
In addition, the responder may ask the initiator to retry a subscription
begin request.

The change does not affect plugin windows, which are created by the
host.

This change also avoids the AudioPluginHost leaving zombie child
processes behind.

The new class hold a list of ChildProcesses and periodically checks
their return value until they report termination. On Linux this check
is necessary to avoid leaving zombie processes behind.

This also adds missing KHRONOS_APIENTRY qualifications to the debug
callback type, which fixes potential crashes when running debug Win32
builds.

This fixes an edge case in which if listeners are both removed and added during a callback the added listener(s) may be called during the same iteration

- Prevent out of scope access of the listeners lock
- Allow clearing the listener list from a callback

viewDidDisappear may be called when a file is successfully selected.
presentationControllerDidDismiss is only called when the controller is
dismissed manually by the user, e.g. by tapping outside the sheet, or by
dragging it away.

Checking for sheet dismissal is necessary in iOS 15, but not in iOS 17.
In iOS 17, tapping outside the file chooser causes a callback to
documentPickerWasCancelled instead.

Even without this change the helpers would build correctly, but Xcode
would be unable to open them in the GUI and present them in red letters.