Better handling of out of bound enum values in ToString.

tests/EnumTests.cpp

@@ -56,6 +56,7 @@ TEST_CASE("Enum To String", "[Utilities]") {
     CHECK(strcmp(TestEnumHelper::ToString(TestEnum::Val1), "Val1") == 0);
     CHECK(strcmp(TestEnumHelper::ToString(TestEnum::Val2), "Val2") == 0);
     CHECK(strcmp(TestEnumHelper::ToString(TestEnum::Val3), "Val3") == 0);
+    CHECK(strcmp(TestEnumHelper::ToString((TestEnum)100), "100") == 0);
 }
 
 TEST_CASE("Enum Get Values", "[Utilities]") {