Mostly remove request

[confused-Techie]

As reported in #468 we still have request in quite a few repos, where it shouldn't be.

This PR removes, most of our direct usage of request. request is still used directly in PPM, and in settings-view here.

But since my PR to bundle PPM into the core, already removes request from settings-view I thought we could leave that for the time being.

Otherwise request is removed from direct usage in both autocomplete-css and language-less. Where it was only used for update scripts, so this should have no effect on users.

I did ensure both of these applications had the same results of running their update scripts from both usage of request and superagent. So their implementation is exactly the same.

With the only real changes needed in either, was within language-less that had some API differences (Mostly it seems that within CoffeeScript it fails to auto parse the content type, so that had to be added in manually, as well as the usage of the Promise callback.

[mauricioszabo]

Mac builds are consistently failing, maybe we either need to merge-back master on this, or see why it isn't actually building...

[confused-Techie]

@mauricioszabo I've just rebased this PR on master lets see if the numerous CI changes can improve our mac builds, or otherwise we know that mac failing to build is the result of this PR and we can investigate further.