Sbpack

New commands to deploy Nextflow and WDL workflows to Seven Bridges platforms

- Fix https://github.com/rabix/sbpack/issues/18
- Other minor fixes and improvements.

- Fix 12
- Document 13

This release fixes an issue with propagating user defined types in inlined steps and adds an option to filter out non SBG tags from the source CWL.

This release adds support for file stdout/stderr file types

This release fixes several issues that manifested as bugs on windows systems.