memory_analyzer: major rework

This patch makes memory_analyzer understand the newly introduced tracepoint
arguments: allocator type, allocated memory and requested alignment.
Allocations are grouped and shown in as a tree together with frequency
information, number of blocks that hasn't been freed yet and amount of
memory wasted by internal fragmentation.

Signed-off-by: Pawel Dziepak <pdziepak@quarnos.org>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>