Add syntax highlighting for raw JS code

[fhammerschmidt]

implements rescript-lang/rescript#6214

[fhammerschmidt]

Note: I did not implement it for "" strings, because I think that would break too easily.

[zth]

Nice! Mind adding to the changelog?

[cristianoc]

Actually would you do it for %ffi?
Notice single %

[zth]

Actually would you do it for %ffi? Notice single %

Judging from the screenshot this already works, no?

[cristianoc]

Actually would you do it for %ffi? Notice single %

Judging from the screenshot this already works, no?

Oh right I did not see the second one.

[fhammerschmidt]

It works for %raw, %%raw and %ffi. And technically also for the non-existent %%ffi, but that should not be an issue, is it?

[cristianoc]

This is great thanks!