Hidden Admin no longer murmurs

Just removes the Murmur message to the room when a caster casts if an
admin is HIDDEN if not still shows the message.

When admin is not DM Hidden:

ADMIN murmurs something under his breath and points a finger at ADMIN.

When admin is DM Hidden:
Nothing
Removes the spell sound if an admin is hidden

Changed from DM to ADMIN to hide murmur and spell sound

If an ADMIN is hidden then when they cast a spell this will not play,
but if they cast ANY spells when hidden it will be logged in debug.
got $ error

When the  otarget was not a player in DEBUG message.
error fix

Noticed an obscure error.
Merge pull request #147 from FSU-Phil/DM-Hidden-No-Murmur

Hidden Admin no longer murmurs or spell sound