HBD stabilizer algorithm

Although the code is not open source, I have made the exact algorithm used by the stabilizer open source as pseudocode here: https://github.com/iamsmooth/hbdstabilizer

My intent is to update the pseudocode any time the algorithm changes.

Contributions of improvements to the algorithm are welcome, but will be accepted only if I decide to implement them in the running code.

Contributions of working code that implements the documented algorithm are also welcome, although in this case, if you don't continue to maintain and submit updates to the code as the algorithm changes, the code will be archived.

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