HLint: Pass options through user config

[rmehri01]

Closes #1509.

I actually got it to work on a sample file using:

"flags": [
    "-iUnused LANGUAGE pragma",
    "-h/Users/ryanmehri/my-hlint-config.yaml"
]

I think the fact that the command line arguments were different than the library ones just threw me off! I'll be working on adding the tests soon.

[ndmitchell]

I'd have expected that all the config options are documented somewhere. If so, this should be added.

[jneira]

Hi, many thanks for your work, the plugin will have a very handy and flexible config option (maybe it will not need no one more 😄)
Maybe to have a positive test would be interesting: starting with no hlint hints, change the config and then check the expected new hint is present, @rmehri01 what do you think?

[rmehri01]

Maybe to have a positive test would be interesting: starting with no hlint hints, change the config and then check the expected new hint is present

Sounds good, I'll add it!

[jneira]

This looks great, many thanks again

[jneira]

Well i guess this is good to go now
//cc @berberman