Refactor ServiceLoader instantiation for use outside of web context

[g105b]

The go/do functions are super useful, and it would be really good to be able to use them outside of the web context, like in cron scripts.

To have a cron script at cron/processThings.php and to simply have a function go(LoadedClass $thing):void { ... } would be SO USEFUL!

There are other use cases other than cron, such as how APIs will work after getting the routing functionality updated.