- Refactor dev-tools/harness.js and dev-tools/smokes.js to separate
out the script/CLI code and implementation code into separate
files.
- Rename 'smoke' to 'exhaustive' ('multi' mode can also be used
for "smoke testing") to better describe its behavior.
- Rewrite the runners in Typescript for type safety.
- Refactor common build utilities into dev-tools/build.js and
introduce the notion of a 'full' build analogous to 'full' tests.
