Core/Misc: Fix change faction on dead Night Elves keeping the speed buff

Fix change faction on dead Night Elves causing the new player keeping the 175% wisp speed buff.
Players will be resurrected automatically on change faction.
Closes #255

src/server/game/Entities/Player/Player.cpp

@@ -5149,8 +5149,9 @@ void Player::ResurrectPlayer(float restore_percent, bool applySickness)
 
     // remove death flag + set aura
     SetByteValue(UNIT_FIELD_BYTES_1, 3, 0x00);
-    if (getRace() == RACE_NIGHTELF)
-        RemoveAurasDueToSpell(20584);                       // speed bonuses
+
+    // This must be called always even on Players with race != RACE_NIGHTELF in case of faction change
+    RemoveAurasDueToSpell(20584);                           // RACE_NIGHTELF speed bonuses
     RemoveAurasDueToSpell(8326);                            // SPELL_AURA_GHOST
 
     if (GetSession()->IsARecruiter() || (GetSession()->GetRecruiterId() != 0))

src/server/game/Handlers/CharacterHandler.cpp

@@ -1768,6 +1768,9 @@ void WorldSession::HandleCharFactionOrRaceChange(WorldPacket& recvData)
         }
     }
 
+    // resurrect the character in case he's dead
+    sObjectAccessor->ConvertCorpseForPlayer(guid);
+
     CharacterDatabase.EscapeString(newname);
     Player::Customize(guid, gender, skin, face, hairStyle, hairColor, facialHair);
     SQLTransaction trans = CharacterDatabase.BeginTransaction();