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WIP: custom allocator/memory pool in HLT1

Olli Lupton requested to merge olupton_custom_allocators into master

This introduces a custom allocator and fast event-local memory pool and uses it to remove [almost] all dynamic [de]allocation in HLT1 algorithms. See LHCb MR for more details.

Goes with LHCb!2313 (closed) and Phys!631 (closed).

WIP reason: probably needs to be broken into more pieces, depending on consensus.

cc: @graven @nnolte @sstahl @ahennequ

Edited by Olli Lupton

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