Core/Movement: Clean up and improvements on Unit::SetSpeed (#16843)

- Clean up of Unit::SetSpeed (mostly cherry picks from the 6.x branch):
- the opcode sent depends on the unit. until now, MSG_MOVE_SET_* were sent for every units which isn't like retail behavior.
- Removed the unused method parameter "forced" from Unit::SetSpeed
- Renamed Unit::SetSpeed to SetSpeedRate
- Removed the unused method parameter "forced" from Unit::UpdateSpeed
- Added utility method Unit::SetSpeed which take the new flat value.
(cherry picked from commit dc3327f9c5f80c36000356829159c060d916f62b)

# Conflicts:
#	src/server/game/Entities/Unit/Unit.cpp
#	src/server/game/Handlers/MovementHandler.cpp
#	src/server/scripts/EasternKingdoms/ZulAman/boss_akilzon.cpp
#	src/server/scripts/EasternKingdoms/ZulAman/boss_nalorakk.cpp
#	src/server/scripts/EasternKingdoms/ZulAman/boss_zuljin.cpp
#	src/server/scripts/Kalimdor/zone_azshara.cpp
#	src/server/scripts/Kalimdor/zone_durotar.cpp
#	src/server/scripts/Outland/zone_hellfire_peninsula.cpp

1 files changed, 2 insertions, 2 deletions

diff --git a/src/server/scripts/Pet/pet_dk.cpp b/src/server/scripts/Pet/pet_dk.cpp
index 80b3a00774b..113b14a0d54 100644
--- a/src/server/scripts/Pet/pet_dk.cpp
+++ b/src/server/scripts/Pet/pet_dk.cpp
@@ -103,8 +103,8 @@ class npc_pet_dk_ebon_gargoyle : public CreatureScript
                 //! HACK: Creature's can't have MOVEMENTFLAG_FLYING
                 // Fly Away
                 me->SetCanFly(true);
-                me->SetSpeed(MOVE_FLIGHT, 0.75f, true);
-                me->SetSpeed(MOVE_RUN, 0.75f, true);
+                me->SetSpeedRate(MOVE_FLIGHT, 0.75f);
+                me->SetSpeedRate(MOVE_RUN, 0.75f);
                 float x = me->GetPositionX() + 20 * std::cos(me->GetOrientation());
                 float y = me->GetPositionY() + 20 * std::sin(me->GetOrientation());
                 float z = me->GetPositionZ() + 40;