Make sure that WiimoteReal is really shutdown on app exit.  Particulary
ensure that the wiimote scanning thread is joined.  This fixes a crash
on shutdown if scanning has been initiated.
Add comments to explain the usage of the WiimoteReal Stop/Shutdown
routine usage.
Allow setting dsp on thread via game ini.

Also force TWW to LLE and no dsp on thread.
Re-add the HandleWiimoteDisconnect calls to the RealWiimote::Shutdown
routine.  This is needed to actually disconnect real wiimotes and delete
the corresponding wiimote objects when the app exits.
Merge branch 'join-wiimote-scanning-thread'