OH Cluster finding updates

Overall this MR reduces latency by ~1.75 bx, and relaxes timing in the cluster finder, and improves maintainability of the cluster finding with a much more robust test bench.

• Completely overhaul the cluster finding test bench
• Cluster sorting improvements:
  • Replace the cluster finding sorter with a v1 optimized version. lower resource, relaxed timing (-0.5 bx)
  • Replace the cluster finding sorter with a v2 even more optimized version. lower latency (-1.0 bx)
  • Move the sorters to their own wrapper module
• Fix issue with TMR control of the cluster finder
• Replace the s-bit oneshot module, reduce latency but remove the disabled option for programmable deadtime (-0.25 bx)
• S-bit strip remapping is done on the 160MHz clock instead of 40MHz, reducing latency (-0.5 bx)
• Cleanup some misc cruft in the repo
• Cluster finder "phase selection" (dav bit extraction) is now automatic and set at the arrival of the first s-bit
• An "invalid cluster" trigger was added to the internal OH s-bit monitor

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 boards/apex/constraints/ku15p.xdc
 boards/apex/constraints/mgt_csc.xdc