refactor(Core/Misc): fmod() to std::fmod() (#9796)

- prefer std functions over C functions

src/server/game/Entities/Object/Object.h

@@ -446,11 +446,11 @@ struct Position
         if (o < 0)
         {
             float mod = o * -1;
-            mod = fmod(mod, 2.0f * static_cast<float>(M_PI));
+            mod = std::fmod(mod, 2.0f * static_cast<float>(M_PI));
             mod = -mod + 2.0f * static_cast<float>(M_PI);
             return mod;
         }
-        return fmod(o, 2.0f * static_cast<float>(M_PI));
+        return std::fmod(o, 2.0f * static_cast<float>(M_PI));
     }
 };
 

src/server/game/Maps/MapMgr.h

@@ -121,11 +121,11 @@ public:
         if (o < 0)
         {
             float mod = o * -1;
-            mod = fmod(mod, 2.0f * static_cast<float>(M_PI));
+            mod = std::fmod(mod, 2.0f * static_cast<float>(M_PI));
             mod = -mod + 2.0f * static_cast<float>(M_PI);
             return mod;
         }
-        return fmod(o, 2.0f * static_cast<float>(M_PI));
+        return std::fmod(o, 2.0f * static_cast<float>(M_PI));
     }
 
     void DoDelayedMovesAndRemoves();

src/server/scripts/Northrend/Naxxramas/boss_kelthuzad.cpp

@@ -156,7 +156,7 @@ public:
 
         float NormalizeOrientation(float o)
         {
-            return fmod(o, 2.0f * static_cast<float>(M_PI)); // Only positive values will be passed
+            return std::fmod(o, 2.0f * static_cast<float>(M_PI)); // Only positive values will be passed
         }
 
         void SpawnHelpers()