fix: prevent negative listener count in AnimatedColor#5
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Added _listeners map and overridden addListener, removeListener, and removeAllListeners to mirror AnimatedValueXY. This prevents _listenerCount from going negative when __detach is called before removeListener.
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Added _listeners map and overridden addListener, removeListener, and removeAllListeners to mirror AnimatedValueXY. This prevents _listenerCount from going negative when __detach is called before removeListener.