Fixed Mac build
Add 'WebSocketServerModule' in case of Mac build that uses boost
Added 'FileOpenEventFilter' for Mac, used to catch early QEvent::FileOpen event (available only on Mac and Symbian according to documentation), so that we get rid of a custom launch script that handles opening of TXML and custom protocols with Tundra. This event handles both of them (files and custom protocols), but the event filter installed on Application object is happening too late if Tundra is opened first time, hence adding this event filter as early as possible.
Added RenderSystem_Headless in mac build script