Major LSP features not supported yet

[tempit]

• [x] - Find references - Only implemented for local classes.
• [x] - Rename symbol - Only implemented for local classes.
• [ ] - Hover - We use CSS hover. Should be replaced by something that shows generated output. If definition exists, VSCode adds it to the hover by itself. This is good.
• [ ] - Document highlights - Not implemented. We can probably use CSS service's feature, since this is limited to the scope of one document.
• [ ] - List document/workspace symbols - Not implemented.
• [x] - Document Formatting - Either create our own formatter, or submit pull requests to beautify, etc.
• [x] - Config settings for Intelligence
• [ ] - Syntax Highlighting - We need our own syntax highlighter, as we're veering further and further off the CSS beaten path.t impl
• [ ] - Code Actions (i.e. show little 'fix me' lightbulb on errors) - Not implemented.
• [ ] - Code Lens - Not implemented.
• [ ] - Format on Type - auto formatting while you type. Not Implemented.