Replace SectionBuilder with function builders#6

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litso wants to merge 6 commits intomasterfrom

function-builders

Commits on Jun 17, 2020

Increment iOS deployment target and Swift version
Erik Strottmann
committed
Update collection protocol conformances
Erik Strottmann
committed
Move Section to its own file
Erik Strottmann
committed
Update tests to be more exhaustive
Erik Strottmann
committed

Commits on Jun 25, 2020

Add function builders to Section and Sections
Erik Strottmann
committed

Commits on Feb 4, 2021

Update to Swift 5.4
Erik Strottmann
committed