Now that VST3 builds are signed before and after manifest generation, it
may be necessary to force-sign in order to overwrite the
previously-applied signature.

To prevent too much disruption to people who have our public projects as
part of their build or testing systems we are temporarily ignoring a
warning about using Xcode 15.

Reintegrates changes from cf9fc84669

This fixes an issue where the app icon would not be visible for
standalone plugin targets.

In order to display a WebKit based webview a plugin will deploy a
temporary standalone executable on the system and host the WebKit
instance inside that.

JUCE no longer depends on built artifacts of the AAX_SDK

The ARA_SDK contains unguarded is_lock_free calls. This change
allows us to enable ARA compilation on Linux.