wip/heaptrack nb1 NetBSD

Heaptrack traces all memory allocations and annotates these events with stack traces. Dedicated analysis tools then allow you to interpret the heap memory profile to:

* find hotspots that need to be optimized to reduce the memory footprint of your application * find memory leaks, i.e. locations that allocate memory which is never deallocated * find allocation hotspots, i.e. code locations that trigger a lot of memory allocation calls * find temporary allocations, which are allocations that are directly followed by their deallocation