Core/Units: Partial implementation of SMSG_MOVE_SET_COLLISION_HGT - send proper character collision height on dismount.

Fixes #2642

NOTE: Still have to properly implement collision height calculation for mounting up.

src/server/game/DataStores/DBCStructure.h

@@ -723,7 +723,7 @@ struct CinematicSequencesEntry
 struct CreatureDisplayInfoEntry
 {
     uint32      Displayid;                                  // 0        m_ID
-                                                            // 1        m_modelID
+    uint32      ModelId;                                    // 1        m_modelID
                                                             // 2        m_soundID
                                                             // 3        m_extendedDisplayInfoID
     float       scale;                                      // 4        m_creatureModelScale
@@ -754,6 +754,28 @@ struct CreatureFamilyEntry
                                                             // 27       m_iconFile
 };
 
+struct CreatureModelDataEntry
+{
+    uint32 Id;
+    //uint32 Flags;
+    //char* ModelPath[16]
+    //uint32 Unk1;
+    //float Scale;                                           // Used in calculation of unit collision data
+    //int32 Unk2
+    //int32 Unk3
+    //uint32 Unk4
+    //uint32 Unk5
+    //float Unk6
+    //uint32 Unk7
+    //float Unk8
+    //uint32 Unk9
+    //uint32 Unk10
+    float CollisionWidth;
+    float CollisionHeight;
+    //float Unk11;                                            // Used in calculation of unit collision data when mounted
+    //float Unks[11]
+};
+
 #define MAX_CREATURE_SPELL_DATA_SLOT 4
 
 struct CreatureSpellDataEntry