Merge for v7.3.2

[raphaelquast]

🌳 New

• you can now use style kwargs when adding multiple preset-features, e.g.:
  m.add_feature.preset("coastline", "ocean", "land", alpha=0.5)

🌦️ Changes

• The figure-header added by the jupyter-notebook ipympl backend is now hidden by default
  (To re-enable the header, use m.f.canvas.header_visible = True)

🔨 fixes

• fix UserDefined classification issue: max-bin replaced by data-max
• fix issues with RGBA snapshots for inline plots in jupyter notebooks

[codecov]

Codecov Report

Attention: 19 lines in your changes are missing coverage. Please review.

Comparison is base (1feedc8) 75.61% compared to head (2323646) 75.41%.
Report is 14 commits behind head on master.

Files	Patch %	Lines
eomaps/helpers.py	79.06%	18 Missing ⚠️
eomaps/eomaps.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #193      +/-   ##
==========================================
- Coverage   75.61%   75.41%   -0.21%     
==========================================
  Files          24       24              
  Lines       11102    11162      +60     
==========================================
+ Hits         8395     8418      +23     
- Misses       2707     2744      +37     

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