Workspace command runner

Usage:

wsrun cmd [<package>] [options]

Options:
  Mode (choose one):
    --parallel                      fully parallel mode (default)
    --stages                        run in stages; start with packages that have no deps.
    --serial                        same as "stages", but with no parallelism at the stage level

  Individual package opts:
    -r, --recursive                 execute the same cmd on all of its dependencies, too

  Misc:
    --fast-exit                     if at least one command exits with code > 0, abort
    --collect-output                (not impl) collect per-package stdout, print everything at the end, grouped
    --prefix-logs                   (not impl) prefix stdout lines with "package_name |"
    --bin=yarn                      which program should we pass the cmd to

Examples:

yarn wsrun watch will run yarn watch on every individual package, in parallel.

yarn wsrun build --stages will build all packages, in stages, starting from those that don't depend on other packages.

yarn wsrun watch planc -r will watch planc and all of its dependencies.

yarn wsrun build h4zip -r --stages will build all the deps. in order, then build h4zip

yarn wsrun clean will remove the build folders in every package.

yarn wsrun test will test every package.

Todo:

• Support for collecting stdouts
• Support for stdout line prefixes
• Reorganize files