Core/Units:

- Implement UNIT_FIELD_HOVERHEIGHT (requires DB data). This field, sent in update object packet, will determine the height at which a creature hovers if it has movementflag_hover applied. Note that hovering will now update the server-sided z-coordinate by the value of this field, and that all subsequent positional updates to the client will need to send z coordinate MINUS the hover height offset, or the hoverheight will be visually doubled client side.
- Correct our usage of movementflag_flying, movementflag_can_fly, movementflag_hover and movementflag_disable_gravity (previously levitate), and how they relate to InhabitType in the database. This fixes "flying creatures on steroids" bug (wings flapping too fast), and potentially a lot of visual issues in AI scripts. Note that a lot of scripts still set wrong movementflags, these need to be fixed on a case by case basis.
- Send correct packets for SPELL_AURA_FEATHER_FALL, SPELL_AURA_WATER_WALK and SPELL_AURA_HOVER apply/unapply.
- Send correct packet contents for movement update in Unit::SetSpeed.
- Misc. cleanup in affected scripts.

src/server/scripts/Outland/HellfireCitadel/HellfireRamparts/boss_vazruden_the_herald.cpp

@@ -145,7 +145,7 @@ class boss_nazan : public CreatureScript
                         flight = false;
                         BellowingRoar_Timer = 6000;
                         ConeOfFire_Timer = 12000;
-                        me->SetLevitate(false);
+                        me->SetDisableGravity(false);
                         me->SetWalk(true);
                         me->GetMotionMaster()->Clear();
                         if (Unit* victim = SelectTarget(SELECT_TARGET_NEAREST, 0))
@@ -374,7 +374,7 @@ class boss_vazruden_the_herald : public CreatureScript
                 if (summoned->GetEntry() == ENTRY_NAZAN)
                 {
                     CAST_AI(boss_nazan::boss_nazanAI, summoned->AI())->VazrudenGUID = VazrudenGUID;
-                    summoned->SetLevitate(true);
+                    summoned->SetDisableGravity(true);
                     summoned->SetSpeed(MOVE_FLIGHT, 2.5f);
                     if (victim)
                         AttackStartNoMove(victim);

src/server/scripts/Outland/HellfireCitadel/HellfireRamparts/boss_watchkeeper_gargolmar.cpp

@@ -87,7 +87,7 @@ class boss_watchkeeper_gargolmar : public CreatureScript
             {
                 if (!me->getVictim() && me->canCreatureAttack(who))
                 {
-                    if (!me->canFly() && me->GetDistanceZ(who) > CREATURE_Z_ATTACK_RANGE)
+                    if (!me->CanFly() && me->GetDistanceZ(who) > CREATURE_Z_ATTACK_RANGE)
                         return;
 
                     float attackRadius = me->GetAttackDistance(who);