add api: xtime/xdebug/xfile
Merge pull request #17 from caiywHub/feature_1

add api: xtime/xdebug/xfile，缺少xtime的部分实现
fix xC.pro/xdebug/xfile
Merge pull request #22 from guangbin79/fix_api

fix xC.pro/xdebug/xfile
fix compile warnings
Merge pull request #23 from guangbin79/fix_api

fix compile warnings