Extract alloc

[jrbyrnes]

1. clean up the bulk of the warnings seen when building on Optimizer-AMD
2. Pull allocators out of the enumerator, and into the main scheduler class -- this allows for better memory management as we have memory preserved over all regions for both scheduling passes (as opposed to just one pass for one region)
3. Disable post processing the history table -- tons of cycles spent walking over the history table after scheduling and doing nothing
4. Disable stats::tracking, this is shared data across threads and is causing major caching problems

[jrbyrnes]

Was deferring this review, as it will cause rebase headaches, but due to project inactivity, it seems I might as well push it.