Rename remaining saw-script-- variables in flycheck-saw-script.el

[WeeknightMVP]

After installing flycheck via MELPA and manually installing flycheck-saw-script.el, Emacs 26.2 reports an error during initialization:

Symbol's value as variable is void: saw-script--output-regexp

Prefixing this variable name with flycheck- yields an error when opening a .saw file:

Error from syntax checker saw-script: Symbol’s value as variable is void: saw-script--info-start-regexp

Prefixing this with flycheck- evidently makes flycheck work with saw-script major mode.

[weaversa]

I tried installing this as well today and had issues. It would be nice if this worked.

[weaversa]

@chameco Thank you so much! This is great to have! Been using it all day today and it's made programming in saw-script soooooo much easier.