[WIP]glslify support

[fand]

It's still experimental. Please give me some advice if you are interested 😸

https://github.com/stackgl/glslify/issues/95

Changes

• Added Use glslify to config
• Uses forked version of glslify to generate sourcemaps

[fand]

It parses sourcemaps and shows the error line (almost) correctly.

[Arcanemagus]

This is a very interesting idea, I'm not too sure about moving forward with it here though until support is more baked into the tools behind this.

Thoughts @andystanton?

[andystanton]

@fand @Arcanemagus I think this is a fantastic idea.

As you've already discussed, the sourcemap work needs to be merged in glslify first, but then we can definitely take a look at the best way to integrate it.

I would embrace making glslify linting the default as it will work out of the box, but still give the user the option to use glslangValidator if they prefer to have official Khronos validation.