Added "/service" switch, to prompt the binary to attempt starting as a service.
Added service* methods, to control service startup.
Split up main() into universalMain(), which contains the startup code for both service and normal start.
Added cRoot::m_RunningAsService bool,
Added cRoot::SetStopping(bool) to allow a stop request to be sent by the service controller.
Added cBlockIDMap::init() to avoid loading items.ini before the working directory has been set.
