Add a function `shellSplit(string)` to the global namespace of job
compiler scripts. It splits a string into an array of strings using
shell/CLI semantics.
For example: `shellSplit("--python-expr 'print(1 + 1)'")` will return
`["--python-expr", "print(1 + 1)"]`.
Back in the days when I wrote the code, I didn't know about the
`require` package yet. Using `require.NoError()` makes the test code
more straight-forward.
No functional changes, except that when tests fail, they now fail
without panicking.
The add-on code was copy-pasted from other addons and used the GPL v2
license, whereas by accident the LICENSE text file had the GNU "Affero" GPL
license v3 (instead of regular GPL v3).
This is now all streamlined, and all code is licensed as "GPL v3 or later".
Furthermore, the code comments just show a SPDX License Identifier
instead of an entire license block.
