ASF-ui should use new /Api/WWW/GitHub/Wiki endpoints for wiki calls

[JustArchi]

Description

See #1319 for preface. The problematic code lies in fetchWiki.js

ASF includes two new internal API endpoints as replacement for removal of /Api/WWW/Send:

Expected behavior

For fetching history, /Api/WWW/GitHub/Wiki/History/Setting-up:

{
  "Result": {
    "b08d6e69d5fba278db7b0bd56a4e238411dcd22e": "2019-12-05T16:43:02Z",
    "7ccc39f95cc6eaddf64497eea5b9b2959c5da318": "2020-03-06T23:24:53Z",
    "678c4fd13f4a24c1cd9e38a9eac61826fc3f1bb0": "2019-09-12T12:32:08Z",
    ...
    "2c44661fcbf2617fe2db8301ad299f5037949faf": "2020-11-12T13:46:30Z",
    "728cc49cf8c5c3baef0b8cd43e7e6f1237f8bd97": "2020-09-01T09:57:50Z",
    "931566731788f1a3f6ddc103e999f737e2dec846": "2020-11-12T13:46:52Z"
  },
  "Message": "OK",
  "Success": true
}

ASF-ui is expected to sort this output by dates, if appropriate.

---

For fetching specific pages, /Api/WWW/GitHub/Wiki/Page/Setting-up, accepts also optional ?revision= query argument.

{
  "Result": "<h1>\n<a id=\"user-content-setting-up\" class=\"anchor\" href=\"#setting-up\" aria-hidden=\"true\"><svg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"><path fill-rule=\"evenodd\" d=\"M7.775 3.275a.75.75 0 001.06 1.06l1.25-1.25a2 2 0 112.83 2.83l-2.5 2.5a2 2 0 01-2.83 0 .75.75 0 00-1.06 1.06 3.5 3.5 0 004.95 0l2.5-2.5a3.5 3.5 0 00-4.95-4.95l-1.25 1.25zm-4.69 9.64a2 2 0 010-2.83l2.5-2.5a2 2 0 012.83 0 .75.75 0 001.06-1.06 3.5 3.5 0 00-4.95 0l-2.5 2.5a3.5 3.5 0 004.95 4.95l1.25-1.25a.75.75 0 00-1.06-1.06l-1.25 1.25a2 2 0 01-2.83 0z\"></path></svg></a>Setting up</h1>\n<p>If you arrived here for the first time, welcome! We're very happy to see yet another traveler that is interested in our project, ...</p>",
  "Message": "OK",
  "Success": true
}

Current behavior

ASF-ui uses now-deprecated /Api/WWW/Send for that functionality. This will stop functioning in approx. 60 days from now.

[github-actions]

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