Remove unused DSL syntax

[bentsherman]

Third batch of changes from #3344 . This PR removes some unused code related to DSL syntax:

• remove old module include syntax
• remove from / into syntax for process inputs/outputs
• remove old process named args syntax
• remove set qualifier for process inputs/outputs

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[bentsherman]

Okay @pditommaso this PR is ready to go. Now that I have a much deeper understanding of the AST transforms, I'm confident these changes only remove dead code from the DSL1 syntax.

With these simplifications I was able to improve the error checking for process inputs and outputs. So we don't need the hack from #4085 anymore because we can catch it during compilation.