Embed recommended high altitude rule into prayer calculations

[basememara]

Wondering what your thoughts are on baking in the high altitude recommendation into the prayer calculations. I tried to do this in a backwards compatible way so the multiple nil-coalescing is a little funky.

You can see I had to fix a unit test that was failing because of this change, but it's a good failing because this change caught a non-sense prayer times table for the UK.

This PR is in draft mode until discussed and repointed to develop branch after it gets updated.

[z3bi]

thankfully nightPortions is not a public method so we don't really need to maintain backwards compatibility and we can make the coordinates required. That should simplify some of the unwrapping logic.

In general I think this is a good improvement 👍

[basememara]

Sweet, ok I made the update and changed to review.