Added 3d skybox, in-house rooms (not enterable ofcourse), made map brighter, fixed ammo bug on xm1014, fixed collision issues in the middle of the map and added a bomb plant in the center with a support of demolition gamemode.

Finally updated the map, old version can be found here: http://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=128042593