Feature/country shapes

[JamesVarndell]

Adds the polygons submodule, which initially just contains a function for getting geometries for named countries.

[FussyDuck]

All committers have signed the CLA.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.84%. Comparing base (d08b2ad) to head (2f2ed77).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #12      +/-   ##
===========================================
+ Coverage    96.17%   96.84%   +0.66%     
===========================================
  Files            5        6       +1     
  Lines          157      190      +33     
  Branches         9        7       -2     
===========================================
+ Hits           151      184      +33     
  Misses           3        3              
  Partials         3        3              

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