Reduce logging resource utilization:

Reduce logging resource utilization:

Tests run using stompngo_examples/publish.

// Old code, with many HexData calls at runtime
// 1000 messages

real	9m18.706s
user	0m9.964s
sys	0m2.716s

real	9m21.936s
user	0m10.280s
sys	0m2.868s

real	9m22.222s
user	0m9.656s
sys	0m2.752s

// New code, with optional HexData calls depending on a logger present
// 1000 messages

real	9m10.223s
user	0m1.468s
sys	0m2.500s

real	9m22.370s
user	0m1.448s
sys	0m2.552s

real	9m24.794s
user	0m1.456s
sys	0m2.348s

// Old code, with many HexData calls at runtime
// 5000 messages

real	46m9.885s
user	0m50.092s
sys	0m13.928s

// New code, with optional HexData calls depending on a logger present
// 5000 messages

real	46m6.997s
user	0m7.216s
sys	0m12.000s