Cleanup for The Diagram Styles

[JustinSGray]

Purpose

It was silly that all the xdsm scripts had the same hand-coded constants related to the diagram styles. I moved the constants into the XDSM.py file and changed all the examples to use the constants instead.

Type of change

New feature (non-breaking change which adds functionality)

Testing

I updated all the tests to use the new constants.

Checklist

Put an x in the boxes that apply.

• I have run unit and regression tests which pass locally with my changes
• I have added new tests that prove my fix is effective or that my feature works
• I have added necessary documentation

[ewu63]

Just to confirm, these constants are the ones used to map to the specific component styles right? I.e. these lines? So the names are not arbitrary since they must match the tikz style exactly, and all you did was to put these into the XDSM.py file so that they can be imported.

[JustinSGray]

You understand correctly! The names must match the tikz styles exactly... so now they are just importable