Core/Gameobjects: Fix an exploit where it was possible to use gameobjects from any distance. Fixes for example picking up the WSG flag from any distance using hacking tools.

src/server/game/Entities/GameObject/GameObject.cpp

@@ -2209,3 +2209,19 @@ void GameObject::GetRespawnPosition(float &x, float &y, float &z, float* ori /*
     if (ori)
         *ori = GetOrientation();
 }
+
+float GameObject::GetInteractionDistance()
+{
+    switch (GetGoType())
+    {
+        /// @todo find out how the client calculates the maximal usage distance to spellless working
+        // gameobjects like guildbanks and mailboxes - 10.0 is a just an abitrary choosen number
+        case GAMEOBJECT_TYPE_GUILD_BANK:
+        case GAMEOBJECT_TYPE_MAILBOX:
+            return 10.0f;
+        case GAMEOBJECT_TYPE_FISHINGHOLE:
+            return 20.0f + CONTACT_DISTANCE; // max spell range
+        default:
+            return INTERACTION_DISTANCE;
+    }
+}