add option for m.set_frame() to use arbitrary geometries as map-bound…

[raphaelquast]

Add new option to m.set_frame() to use arbitrary geometries as map-boundaries.

m.set_frame(gdf=< geopandas.GeoDataFrame to use as map boundary>)

TODO

• check progress of fix treatment of spine paths with explicit path-codes SciTools/cartopy#2362
• Add convenience function to use country-boarders from NaturalEarth shapefiles?

[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 21 lines in your changes missing coverage. Please review.

Project coverage is 75.04%. Comparing base (e17df4e) to head (8e3cb54).
Report is 8 commits behind head on dev.

Files with missing lines	Patch %	Lines
eomaps/eomaps.py	25.00%	21 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #237      +/-   ##
==========================================
- Coverage   75.17%   75.04%   -0.14%     
==========================================
  Files          27       27              
  Lines       11856    11878      +22     
==========================================
+ Hits         8913     8914       +1     
- Misses       2943     2964      +21     

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