PongChamp language server

To start off:
* [ ] Syntax highlighting
* [ ] Snippet completion
* [ ] Bracket matching
* [ ] Bracket autoclosing
* [ ] Bracket autosurrounding
* [ ] Comment toggling
* [ ] Auto indentation
* [ ] Folding (by markers)

https://code.visualstudio.com/api/language-extensions/overview

Then implementing a language server to do static code analysis.