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Expand XUI-visible LLUICtrl::CommitCallbackRegistry operations to include
"SideTray.Toggle" and "SideTray.Collapse".
Give LLSideTrayListener friend access to LLSideTray so it can query the
attached and detached tabs. Introduce tab_cast template to deal with the
unavailability of the LLSideTrayTab class outside of llsidetray.cpp.
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