Draft hybrid pool+malloc allocator
Add hybrid allocator to cmdline
Disable unnecessary debug prints by default
Release not: hybrid allocator
Add commented out allocator options
Merge branch 'add-hybrid-alloc-example'

Add a hybrid pool allocator example to the distibution.  The allocator uses
a fixed set of pools for small allocations but falls back to malloc etc for
larger sizes and when the pools are exhausted.  This reduces churn on the
platform memory allocator which is beneficial for platforms where the platform
allocator is not tuned for a lot of small allocations.