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The next task is to move all FrameBuffer message-related functionality into its own class.

changed LauncherDialog and EditableWidget ContextMenu and dialog shade surface creation to on demand

Remove cache of surfaces from FrameBuffer, into each dialog that owns it.
Make surfaces be unique_ptr instead of shared_ptr, so we can be sure cleanup occurs.

This reverts commit 9bd2f3e4.

added single save states commands to TimeMachine dialog