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allowing world coordinates as input in Image.set_center() #56

@kswang1029

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@kswang1029

Currently, Image.set_center() takes two numbers as the image coordinates as the input. For a better usability, we will need to also support inputs as world coordinates such as:

Image.set_center('12h34m.56.789s', '-10d20m30.45s')
Image.set_center('123.3456deg', '-12.3456deg')

This may be straightforward once CARTAvis/carta-frontend#1176 is implemented (otherwise we will need to handle image<->world coordinates transformation...)

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