Add basic TypeScript and improve TSX support (#208)

Basic highlighting support for TypeScript & TSX

Added basic support to highlight TypeScript & TSX syntax more
consistently through the HerringtonDarkholme/yats.vim plugin [1].
This includes improvements to highlight...

1. ...TypeScript interface an class names using `nord7` as foreground,
   where interfaces also use the bold attribute, to match with
   structs/classes.
2. ...global methods like e.g. `setTimeout` with `nord8` using the
   italic attribute to mark it kind of static. 
3. ...regular expressions with `nord13` as foreground color instead of
   the normal color for quoted strings (`nord14`) to make it easier to
   differ between both. 
4. ...global objects like `Error`, `JSON` and `console` with `nord7`.
5. ...primitive/builtin types like `string` with `nord9`.
6. ...TypeScript type references with `nord7`.
7. ...TypeScript specific characters like for type annotations (`:`) and
   member optionality (`?`) as operator with `nord9`.

This also includes improvements for "vanilla" JavaScript elements.

[1]: https://github.com/HerringtonDarkholme/yats.vim

Resolves GH-208

Co-authored-by: Arctic Ice Studio <development@arcticicestudio.com>
Co-authored-by: Sven Greb <development@svengreb.de>

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