Several modules should support an array of arguments

[skx]

When working on #66 I had to write:

directory {
          target => "${archive}",
          state  => "present",
}
directory {
          target => "${install}/go-${version}",
          state  => "present",
}

This would have been nicer:

directory {
          target => [ "${archive}", "${install}/go-${version}", ]
          state  => "present",
}

To be honest many of our modules should accept arrays rather than just strings, but it was easier to write them in the way that felt natural - so package installation supports arrays, for example, because I do use that a lot. But log, fail, etc, etc, do not because I didn't need them to do so initially.

[skx]

Definitely fix this, and also the shell module.

[skx]

Checked the other modules and non really make sense to update - except for "log" or "fail" which aren't huge priorities.

Files can't because the content/type needs to vary. Same argument for symlinks.

Git repositories need a per-repo destination. Users can have different args too.