Code cleanup.
Use a unique tag type for the Stim error tags.
Only pass up the StimErrorTag in the parser, make the tagger create the TagSpan for it.
Move Stim Tagger Provider class into a new file.
Add color customization to the stim file error tag squiggles.
Move error definitions to the common editor definitions file.
Fix missing files in the project.
Fix parser - error on lines that only happen to start with a valid directive prefix.
Merge pull request #1 from abcminiuser/master

Clean up code, add customizable squiggle color setting, fix parser.