Make it possible to adjust the pCampbot login delay via the [BotManager] LoginDelay parameter of pCampbot.ini
Fix a further bug in pCampbot connect where ignoring already connected bots was wrongly counted as a connect

Also, only sleep when we actually perform a connection
minor: remove mono compiler warning from LLClientView
minor: Correct typo on "debug stats record start" message
Refactor: merge SceneGraph.AddScenePresence() into CreateAndAddChildScenePresence() since the former was only ever called from the latter

This allows us to remove dead code relating to adding root agents directly to the scenegraph, which never happens.
Remove old and unused ScenePresence.RestoreInCurrentScene()
Make it possible for the "deregister region id" command to accept more than one id
remove redundant return at end of HandleDeregisterRegion()
Make pCampbot "show bot" command take the bot number instead of the full bot name

Shorter and can do this because bot names are uniform
minor: shortern warning messages in EntityTransferModule when UpdateAgent() fails