add go-sclang compatibility

[WnP]

Hi there,

I'm go-sclang author and I think scvim could get benefit from it.

go-sclang implement a HTTP server and a HTTP client on top of sclang.

Unlike the ruby pipe and dispatcher implementation go-sclang is able to return the returned value from sclang.

I've made a solution for #46 which open .schelp files directly in a vim split based on go-sclang, then one can interact with SCDoc examples directly in vim.

And here is another solution to solve #36/#48 without using vim in server mode.

Let me know your thoughts

[gusano]

@WnP thanks, this looks really cool but I'm super busy right now.
I'll try to thoroughly test and review that in the next couple of weeks