Fix incorrect pointer marshalling from Variant to managed runtime

#1992

Source/Engine/Engine/NativeInterop.Unmanaged.cs

@@ -1271,6 +1271,9 @@ namespace FlaxEngine.Interop
             case Type _ when type == typeof(IntPtr):
                 monoType = MTypes.Ptr;
                 break;
+            case Type _ when type.IsPointer:
+                monoType = MTypes.Ptr;
+                break;
             case Type _ when type.IsEnum:
                 monoType = MTypes.Enum;
                 break;

Source/Engine/Engine/NativeInterop.cs

@@ -1112,11 +1112,9 @@ namespace FlaxEngine.Interop
 
             internal static void ToManagedPointer(ref IntPtr managedValue, IntPtr nativePtr, bool byRef)
             {
-                Type type = typeof(T);
-                byRef |= type.IsByRef; // Is this needed?
-                if (type.IsByRef)
-                    Assert.IsTrue(type.GetElementType().IsValueType);
-                managedValue = byRef ? nativePtr : Unsafe.Read<IntPtr>(nativePtr.ToPointer());
+                if (byRef)
+                    nativePtr = Unsafe.Read<IntPtr>(nativePtr.ToPointer());
+                managedValue = nativePtr;
             }
 
             internal static void ToManagedHandle(ref ManagedHandle managedValue, IntPtr nativePtr, bool byRef)

Source/Engine/Scripting/ManagedCLR/MUtils.cpp

@@ -1208,6 +1208,10 @@ void* MUtils::VariantToManagedArgPtr(Variant& value, MType* type, bool& failed)
             object = nullptr;
         return object;
     }
+    case MTypes::Ptr:
+        if (value.Type.Type == VariantType::Null)
+            return nullptr;
+        return (void*)value;
     default:
         break;
     }