v1.4.0

DataclassArrays:
- Added: v3d.Spec360 camera spec to support 360 videos.
v3d.math:
- Added: v3d.math.interp_img
- Added: v3d.math.carthesian_to_spherical and
  v3d.math.spherical_to_carthesian
Visualization:
- Added: v3d.make_fig supports v3d.make_fig(a, b, c) (in addition of
  v3d.make_fig([a, b, c]))
- Added: v3d.fig_config.cam_scale to globally control the size of the
  cameras.
- Changed: Do not add 0 suffix in the figure labels (for the first
  element)
- Fixed: v3d.make_fig(pts, num_samples_point3d=None) works (previously
  the argument had no effect).
Fixed: Subsampling for displaying simple np.array point clouds (regression
from previous release).

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