Add the hemlock_house encounter set (#14)

* Add `hemlock_house`

* fix some things

* Update fhvc.json

Co-authored-by: drawntotheflame <[email protected]>

* Apply suggestions from code review

Co-authored-by: drawntotheflame <[email protected]>

* sorting

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Co-authored-by: drawntotheflame <[email protected]>