Migrate to GitHub Actions

* Remove fold1 from Foldable1

* Add back foldMap1Default

* Deprecate and split foldMap1Default into foldMap1DefaultL and foldMap1DefaultR

* Generate CHANGELOG.md file using notes from previous GH releases

* Add pull request template

* Refactor functors and related packages

This is part of a set of commits that rearrange the dependencies between
multiple packages. The immediate motivation is to allow certain newtypes
to be reused between `profunctor` and `bifunctors`, but this particular
approach goes a little beyond that in two ways: first, it attempts to
move data types (`either`, `tuple`) toward the bottom of the dependency
stack; and second, it tries to ensure no package comes between
`functors` and the packages most closely related to it, in order to open
the possibility of merging those packages together (which may be
desirable if at some point in the future additional newtypes are added
which reveal new and exciting constraints on the module dependency
graph).

* fixup! Refactor functors and related packages

* Update CI to build with the latest version of the compiler

* Update the bower repository URL to match the URL in the registry

* Upgrade bower dependencies

* Update the changelog

* Fix warnings revealed by v0.14.1 PS release

* Update changelog

* Convert foreign modules to try bundling with esbuild

* Migrated FFI to ES modules via 'lebab'

* Replaced 'export var' with 'export const'

* Removed '"use strict";' in FFI files

* Update to CI to use 'unstable' purescript

* Update pulp to 16.0.0-0 and psa to 0.8.2

* Update Bower dependencies to master

* Update .eslintrc.json to ES6

* Added changelog entry

Co-authored-by: Cyril Sobierajewicz <sobierajewicz.cyril@gmail.com>

* Update the bower dependencies

* Update Node to 14 in CI

* Update the changelog

* Update bower.json

* Fix test due to math import

Co-authored-by: Thomas Honeyman <hello@thomashoneyman.com>

* adjust the foldrDefault and foldlDefault functions to be stack safe

* performance tuning of folding the FreeMonoidTree

* add stack safety tests, and some benchmarks

* update the CHANGELOG