Madcubapy

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- New features:

- Add ``contours`` module to `regions` package with ``check_contour``,
``import_region_contourset``, and ``import_region_patch`` functions.

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- New features:

- Create `regions` package to work with MADCUBA, pyroi, CRTF, and DS9 rois
with ``import_roi`` and ``export_roi`` functions.

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- New features:

- Create `coordinates` > ``conversions`` module with ``fits_to_python``,
``python_to_fits``, ``world_to_pixel``, ``pixel_to_world``,
``angle_to_pixels``, and ``pixels_to_angle`` functions.

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- New features:

- Create `coordinates` subpackage.

- Crete transforms module with ``transform_coords_axes`` and
``transform_coords_fitsmap`` functions.

- Add ``copy_zoom_axes``, ``copy_zoom_fitsmap``, and ``sync_zoom`` to
``visualization`` package.

- Changes:

- Move and geometry module from utils into coordinates > offsets.

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- Bugfixes:

- Fix swapping right-middle mouse buttons depending on system OS.

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- New features:

- Create ``geometry module in utils subpackage`` with
``get_angle_offset_point``, ``get_angle_separation``,
``get_physical_offset_point``, ``get_physical_separation`` functions.