Switch Carbon language to upstream grammar.

[zygoloid]

Previously it seemingly used a mixture of Go and V grammars!

Checklist:

• I am adding a new extension to a language.
• I am adding a new language.
• I am fixing a misclassified language
• I am changing the source of a syntax highlighting grammar
  • Old: https://github.com/0x9ef/vscode-vlang
  • New: https://github.com/carbon-language/carbon.tmbundle
• I am updating a grammar submodule
• I am adding new or changing current functionality
• I am changing the color associated with a language

[lildude]

Please follow the instructions for replacing a grammar detailed in the CONTRIBUTING.md file.

[zygoloid]

Please follow the instructions for replacing a grammar detailed in the CONTRIBUTING.md file.

Done. (I assume you don't actually want vendor/grammars/vscode-vlang removed, since it's still used for V, so I reverted that change that the script made.)

I also fixed up some broken syntax and some other slightly odd things in the Carbon sample code.

[lildude]

I also fixed up some broken syntax and some other slightly odd things in the Carbon sample code.

We generally don't modify samples as they're expected to be correct at the time they were added and help identify older files as a language's syntax evolves. If the language has evolved, it's best to add new samples and leave the old as-is.

[zygoloid]

I also fixed up some broken syntax and some other slightly odd things in the Carbon sample code.

We generally don't modify samples as they're expected to be correct at the time they were added and help identify older files as a language's syntax evolves. If the language has evolved, it's best to add new samples and leave the old as-is.

These samples were never correct. (But nor was using the V syntax highlighter or the Go syntax highligher to highlight Carbon. This language was set up pretty strangely.)