Manchester City have signed Jamaica international striker Khadija Shaw on a three-year deal, the type of long-term deal that is becoming increasingly common in women's games as continued investment and growth allow for more than just short-term planning.Budget constraints have long ensured that players have often had to survive season to season in the past, with many clubs rarely knowing if the funds will be available for more than a year at a time. But even though it is still a problem for many teams and players, even if…