RFE: basic introspection would be nice, easy to add feature

[noblem]

It is useful to have files created by tasks/workflows reflect the name of the thing that created them, like

task Foo {
     command {
             echo "blah blah blah" > Foo_output.txt
              ...
     }
     ...
}

But right now this name has to be hardcoded into the WDL. It would be cleaner and more robust (e.g. to changes in the workflow or task name) if it could instead be referenced by introspection, such as ${__name__} or something. Rather than duplicating the task name as a hardcode in multiple places within the various sections of the WDL body.