By Andrew MacAskill and William James LONDON (Reuters) -Presidents, prime ministers and monarchs from around the world will travel to London over the weekend to pay their respects to Queen Elizabeth and attend a reception at Buckingham Palace to be hosted by King Charles the day before her funeral. U.S. President Joe Biden and French President Emmanuel Macron are among the most high-profile guests from overseas who have confirmed they will be attending. Heads of state and other senior foreign dignitaries will be asked to gather at the Royal Hospital, a retirement and nursing home for veteran s…