Core/Misc: improve error log messages by adding more info. Specially for Aokromes.

src/server/game/Spells/Spell.cpp

@@ -2374,7 +2374,8 @@ void Spell::SelectEffectTargets(uint32 i, uint32 cur)
                             AddUnitTarget(driver, i);
                     break;
                 default:
-                    sLog->outError("Unhandled spell target %u", cur);
+                    sLog->outError("SPELL (caster[type: %u; guidlow: %u], spell: %u): unhandled spell target (%u)",
+                        m_caster->GetTypeId(), m_caster->GetGUIDLow(), m_spellInfo->Id, cur);
                     break;
             }
             break;