Import & update typings from DefinitelyTyped#656

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HoldYourWaffle wants to merge 5 commits intoexpressjs:masterfrom

HeldMyWaffles:integrate-update-typings

Commits on May 6, 2019

Commits on Sep 29, 2019

Use instance methods instead of lambda properties
HoldYourWaffle
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Commits on Aug 6, 2020

Improve type definition accuracy and include tsdocs
HoldYourWaffle
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Commits on Nov 10, 2020

Update to DT merged typings
HoldYourWaffle
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