Code Hightlighting updates

[macevhicz]

Checklist

• I have read the CONTRIBUTING.md document
• I formatted my changes with black
• I linted my changes with flake8
• I have added documentation regarding my changes where necessary
• Any pre-existing tests continue to pass
• Additional tests were made covering my changes

Types of Changes

• Bugfix (change that fixes an issue)
• New Feature (change that adds functionality)
• Documentation Update (if none of the other choices apply)

Proposed Changes

• Speed up CodeHighlighter. Precompile regex patterns, and use a piped keyword regex pattern rather than loop thru keywords. Python regex automatically caches patterns, but since the keyword pattern was being repeatedly re-defined, I think it may have prevented the pattern caching from working as expected.
• Set Code Highlighting colors to match between console and workboxes. The existing workbox colors were hard to differentiate. Also, the console keyword color was the same as stdOut color, so even though it was taking the time to highlight keywords, they were highlighting using the same color as normal output, so not they were not visually distinguishable.
• Call updateColorScheme when setting the language. Currently, linked files had old color scheme when first shown, and after being saved.
• Add an action, with a shortcut, to run the first workbox, where user may have their common imports, helper functions, etc.