wip: board/global search

[recanman]

closes #4

[recanman]

Right now, the search API (GET https://p.4chan.org/api/search?q=${query}&b=${board (optional)}, with header X-Requested-With: p4 f) keeps returning an error.

{
    "errors": ["find.4chan.org: Response status code is not 200, but 403"]
}

Even if I try it on the official client site e.g https://p.4chan.org/_/search?query=example, I still get the same error. I will wait until this merges because I will not assume that this API will return a standard response.