Clean up how pvlib imports optional dependencies#1283

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kandersolar wants to merge 2 commits intopvlib:masterfrom

kandersolar:optional_imports

Commits on Aug 16, 2021

add _optional_import and _DeferredImportError to pvlib.tools
kandersolar
committed
use new import machinery in solarposition.py and ecmwf_macc.py
kandersolar
committed