Debug output only in debug run

[FISHMANPET]

In a number of places I output all the variables or all the files in a folder or some such thing, to help figure out where things are or what state things are in while I'm developing. They're harmless, other than they show some state of the machine, but there's no reason for it to be there all the time. Those "debug" steps should only be run when the system.debug variable is true (can be set when running a build manually from the web, or presumably as a defined variable in the azure-pipelines.yml