abort games before the app exits

Signed-off-by: Takashiro <takashiro@qq.com>
Merge branch 'Qt-4.8' of https://github.com/Fsu0413/QSanguosha-For-Hegemony.git into Qt-4.8
Merge branch 'Qt-4.8' of https://github.com/Fsu0413/QSanguosha-For-Hegemony.git into Qt-4.8