Autocomplete Hinter Parity

[raclim]

Description:

This PR makes progress towards parity with the current autocomplete hinter (styling, context-awareness, ast analyzer) through the following changes:

• Adding back kind labels and ghost text previews to hinter (update-p5-hinter.js, p5-hinter.js, p5CompletionPreview.js)
• Refactor contextaware and analyzer utils to adapt to CM6 and reattach them to hinter (contextAwareHinter.js, getContext.js, p5CodeAstAnalyzer.js, stateUtils,js, p5JavaScript.js)
• Adding in custom keyboard behavior and UI for the hinter dropdown (stateUtils,js, _hints.scss)

Demo:

CM6 Autocomplete Hinter

CM5 Autocomplete Hinter

I have verified that this pull request:

• has no linting errors (npm run lint)
• has no test errors (npm run test)
• has no typecheck errors (npm run typecheck)
• is from a uniquely-named feature branch and is up to date with the develop branch.
• is descriptively named and links to an issue number, i.e. Fixes #123
• meets the standards outlined in the accessibility guidelines

[raclim]

Sorry it's a bit late! I tried to add back in most of the main features in the current hinter—I might've missed a few, but I think it could potentially be added in a follow up?