Stacks of modules were using `extract_path` where it wasn't really semantically correct
because this was the only way to expand environment variables. This commit fixes that
up a bit.
Also, I changed the existing `getenv` function in `stdapi` to `getenvs`, and had it
support the splat operator. I added a `getenv` function which is used just for a
single variable and uses `getenvs` behind the scenes.
The meterpreter console `getenv` command now uses `getenvs`
Was a dumbass again and didn't fully understand how Optints worked when left blank at run time. If not 0 the expire tag will be inserted now. Also made it print the xpath if used because I believe it will be of value to the user for trouble shooting.