MNT: Scheduled removals for 3.0

[effigies]

Ref #849.

[codecov]

Codecov Report

Merging #852 into master will decrease coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #852      +/-   ##
==========================================
- Coverage   90.08%   90.07%   -0.02%     
==========================================
  Files          98       96       -2     
  Lines       12441    12422      -19     
  Branches     2191     2187       -4     
==========================================
- Hits        11208    11189      -19     
  Misses        883      883              
  Partials      350      350

Impacted Files	Coverage Δ
nibabel/freesurfer/mghformat.py	95.55% <ø> (ø)	⬆️
nibabel/deprecated.py	100% <ø> (ø)	⬆️
nibabel/dataobj_images.py	95.52% <ø> (ø)	⬆️
nibabel/analyze.py	98.52% <ø> (ø)	⬆️
nibabel/brikhead.py	97.54% <ø> (ø)	⬆️
nibabel/spm99analyze.py	91.11% <ø> (ø)	⬆️
nibabel/arrayproxy.py	100% <100%> (ø)	⬆️
nibabel/__init__.py	92.72% <100%> (-0.13%)	⬇️

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