New .core CSS class for inputs and buttons

[simonw]

Closes:

• Opt-in mechanism for CSS on form inputs and buttons #2415

Refs:

• Switch to select multiple for editing permissions datasette/datasette-acl#24 (comment)

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📚 Documentation preview 📚: https://datasette--2416.org.readthedocs.build/en/2416/

[simonw]

Documentation:

• https://datasette--2416.org.readthedocs.build/en/2416/custom_templates.html#writing-custom-css
• https://datasette--2416.org.readthedocs.build/en/2416/writing_plugins.html#static-assets

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.60%. Comparing base (92c4d41) to head (f45218b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2416   +/-   ##
=======================================
  Coverage   92.60%   92.60%           
=======================================
  Files          41       41           
  Lines        6425     6425           
=======================================
  Hits         5950     5950           
  Misses        475      475           

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