Force GC to run periodically in order to reduce stuttering

Source/Engine/Engine/NativeInterop.Unmanaged.cs

@@ -1041,6 +1041,24 @@ namespace FlaxEngine.Interop
             valueHandle.Free();
         }
 
+        [UnmanagedCallersOnly]
+        internal static void GCCollect(int generation, int mode, bool blocking, bool compacting)
+        {
+            GC.Collect(generation, (GCCollectionMode)mode, blocking, compacting);
+        }
+
+        [UnmanagedCallersOnly]
+        internal static int GCMaxGeneration()
+        {
+            return GC.MaxGeneration;
+        }
+
+        [UnmanagedCallersOnly]
+        internal static void GCWaitForPendingFinalizers()
+        {
+            GC.WaitForPendingFinalizers();
+        }
+
         [UnmanagedCallersOnly]
         internal static ManagedHandle GetTypeClass(ManagedHandle typeHandle)
         {