AddApplication() returns the token via reference parameter and
additionally returns the team ID of the already running app (if any).
* Implemented AddApplication(), SetThreadAndTeam(), CompleteRegistration(),
IsAppPreRegistered(), RemovePreRegApp(), RemoveApp(), or to to say it
briefly the complete set of app registration helper functions.
* Implemented GetRunningAppInfo() and GetActiveAppInfo().
git-svn-id: file:///srv/svn/repos/haiku/trunk/current@454 a95241bf-73f2-0310-859d-f6bbb57e9c96