Suggestion: semantic highlighting support

[niieani]

It would be great if VS Code supported the paradigm of semantic highlighting.
In short, it makes syntax highlighting more useful, by varying the colors of the same syntax-types of different names in a given scope. This makes it easier to catch mistakes and to see the flow of variables (since every variable in a given scope has a unique color, yet based of the same color range).
Here's an in depth explanation of what is is with some examples: https://medium.com/@evnbr/coding-in-color-3a6db2743a1e#.n2zb9ohw8

Example - before:

Example - after:

[bpasero]

@dbaeumer fyi

[Wosi]

I think it's the same request as "Provide an API for advanced source highlighting": #585

[egamma]

Closing as a duplicate of #585