8381236: VoiceOver Fails to Identify Component After Switching Windows

[mickleness]

This PR automatically calls CAccessible.dispose() as Components are removed from the AWT hierarchy.

CAccessible objects will then be lazily recreated via CAccessible.getCAccessible() if the removed Component is reattached.

I don't have a great understanding of this area of code / subject matter, but this appears to resolve #8381236.

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Issue

• JDK-8381236: VoiceOver Fails to Identify Component After Switching Windows (Bug - P4)

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