feat: Chomp migration, windows build, GitHub CI

[guybedford]

This updates the current build systems to use Chomp, in the process supporting Windows builds, and also migrating from Travis to GitHub CI.

[github-actions]

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Error: Error while trying to generate a snapshot for workflow merge into main.

Error: Command failed: npm run-script build
sh: 1: chomp: not found
npm ERR! code ELIFECYCLE
npm ERR! syscall spawn
npm ERR! file sh
npm ERR! errno ENOENT
npm ERR! systemjs@6.12.1 build: `chomp build`
npm ERR! spawn ENOENT
npm ERR! 
npm ERR! Failed at the systemjs@6.12.1 build script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /home/runner/.npm/_logs/2022-07-24T09_38_59_099Z-debug.log

    at ChildProcess.exithandler (child_process.js:308:12)
    at ChildProcess.emit (events.js:314:20)
    at maybeClose (internal/child_process.js:1051:16)
    at Process.ChildProcess._handle.onexit (internal/child_process.js:287:5)

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_{Generated by file size impact during size-impact#2726775994}