CWL parameter references: detect attempts to use parameters not in the current namespace and suggest a fix

[mr-c]

For example: users might try to access workflow level inputs when doing step level valueFrom parameter references or while using the when conditional execution directive.

We should detect this and present a targeted error message. Ideally we would even show a small source code diff (with correct line numbers) to add that workflow level inputs parameter to the step level in section so it would be visible in the $(inputs) object.