NEW YORK (Reuters) - The dollar slid and global equity markets fell on Monday after U.S. President Donald Trump's remarks over the weekend suggested an end to the trade war with China was still not in sight, dashing recent investor optimism.Moody's warning on Britain's sovereign debt weighed on shares in London, while escalating violence in Hong Kong led Asian equities to post their worst day since August, boosting demand for the safe-haven yen and gold.Trump said on Saturday that the U.S.-Sino..