Added method fetchDisplayName to the Module. It calls the backend to fetch the real name of the player.

Update quit if curl init fails

mv m_oauthauth to modules/extra
Fixed callback function - old version was corrupting the heap.

fetchDisplayName returns result rather than using a member (which would
break when we do the REST-calls non-blocking)

Handle world-service being unavailable

Removed (direct) use of heap when setting displayName