Foreign investors flocked to Myanmar as it began its democratic transition a decade ago, but this week's military coup is likely to accelerate a trend of Western withdrawal - and China's expansion.Myanmar's untapped potential was up for grabs in 2011, when generals in charge of a 49-year junta loosened their iron grip, paving the way for democratic reforms and economic liberalisation in the country of more than 50 million people. Investors pumped money into telecommuni