ZUG, Switzerland (Reuters) - A senior member of the Swiss National Bank said he was open-minded about Facebook's cryptocurrency project, while an Italian official looked for more information as central bankers try to get to grips with the initiative.Facebook revealed plans last week to launch Libra, the latest development in its effort to expand beyond social networking and move into e-commerce and global payments."Overall I think it's an interesting development and I'm pretty relaxed about..