Fling, Herb, Embargo fixes

Fixed some formatting in items.cpp too.

http://pokemon-online.eu/forums/showthread.php?20709-Flinging-Mental-Herb-and-White-Herb-not-working
http://pokemon-online.eu/forums/showthread.php?18336-Metronome-Fling-Glitch

Also fixes bugs with Magic Room and Embargo not reported yet, but discovered throughout testing.