Add intel compiler to CI

[mborland]

Also updates list of tested platforms in the docs

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.1%. Comparing base (4bf4e48) to head (2db4266).
Report is 3 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop    #722     +/-   ##
=========================================
- Coverage     99.1%   99.1%   -0.0%     
=========================================
  Files          230     230             
  Lines        16431   16431             
  Branches      1779    1781      +2     
=========================================
- Hits         16279   16277      -2     
- Misses         152     154      +2     

see 1 file with indirect coverage changes

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