[8475] fixed some gcc-warnings

all warnings from Wunused
and some from Wall

cause unused may be most interesting for some:
they were in following files:
src/game/Level2.cpp
src/game/Map.cpp
src/game/SpellAuras.cpp
src/game/Unit.cpp
src/mangosd/Master.cpp
but i guess mostly someone just fogot to remove this code

for some unsigned vs signed warnings i used:
ack "for.*int .*size\(\)" | ack -v uint

also note for coding:
if you do something like
    if( a && b || c)
just place parentheses around (a && b) && always will have
precedence over || but without parentheses this could be overseen
quite fast (at least that's my guess why gcc will warn for this)

Signed-off-by: balrok <der-coole-carl@gmx.net>

src/game/Spell.cpp

@@ -4866,6 +4866,7 @@ SpellCastResult Spell::CheckCasterAuras() const
                             else if ( m_spellInfo->PreventionType == SPELL_PREVENTION_TYPE_SILENCE)
                                 return SPELL_FAILED_SILENCED;
                             break;
+                        default: break;
                     }
                 }
             }
@@ -5987,4 +5988,4 @@ void Spell::FillRaidOrPartyHealthPriorityTargets( UnitList &TagUnitMap, Unit* me
         TagUnitMap.push_back(healthQueue.top().getUnit());
         healthQueue.pop();
     }
-}
+}