Merge branch '2021-03-14' into 'master'

patches/Decimal-0.5.1.patch

patches/attoparsec-0.13.2.5.patch

patches/cabal-doctest-1.0.8.patch

patches/free-algebras-0.1.0.0.patch

patches/free-algebras-0.1.0.1.patch

patches/hedgehog-1.0.4.patch

patches/hgeometry-ipe-0.11.0.0.patch

patches/integer-roots-1.0.patch

patches/iproute-1.7.11.patch

patches/lens-family-2.1.0.patch

patches/quickcheck-instances-0.3.25.2.patch

patches/salak-0.3.6.patch

patches/singletons-3.0.patch

patches/singletons-base-3.0.patch

patches/subcategories-0.1.1.0.patch

patches/text-short-0.1.3.patch

patches/th-desugar-1.12.patch

patches/th-expand-syns-0.4.6.0.patch