Add support for CCS811 Air Quality Sensor#3404

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wbvreeuwijk wants to merge 7 commits intonodemcu:devfrom wbvreeuwijk:ccs811-dev

Commits on Feb 28, 2021

Merge pull request #1 from nodemcu/master
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Commits on Mar 1, 2021

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Commits on Mar 2, 2021

Commits on Mar 10, 2021