Replace mne legacy functions with modern code

[sappelhoff]

PR Description

• closes Move from pick_types to inst.pick #151

Merge Checklist

• the PR has been reviewed and all comments are resolved
• all CI checks pass
• (if applicable): the PR description includes the phrase closes #<issue-number> to automatically close an issue
• (if applicable): the changes are documented in the changelog changelog.rst
• (if applicable): new contributors have added themselves to the authors list in the CITATION.cff file

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.60%. Comparing base (8421b03) to head (8f54670).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #161      +/-   ##
==========================================
- Coverage   98.60%   98.60%   -0.01%     
==========================================
  Files           7        7              
  Lines         717      715       -2     
==========================================
- Hits          707      705       -2     
  Misses         10       10              

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