Adds static readout buffer #85
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During readout, at least two allocations are made, first into temporary buffers and then into one concatenated buffer sent downstream. The readout servers have considerably more memory than the combined digitizers they read, so there's no reason the digitizer class can't allocate itself a permanent readout buffer with some extra space to replace the temporary buffers, and then just reuse this block rather than reallocating large blocks each and every time we read a single photon. This PR adds this.