Unify coordinate prop data structure.

[connor-makowski]

Each variant in the coordinate prop should all have the same data structure. My suggestion would be to wrap the non path inputs in an additional single length bracket list.

[connor-makowski]

Would love to hear alternative solutions here too.

[connor-makowski]

As a final follow up on this issue, we should add the coordinate prop to general props all example.

[connor-makowski]

See also #299

[connor-makowski]

Note that cave_utils have been updated to automatically handle all coordinate props as list of lists.