Some dep updates

[Martii]

• Please read their CHANGELOGs
• Delete op retested
• request is deprecated and another suitable alternative needs to be found. See Alternative libraries to request request/request#3143 and Request’s Past, Present and Future request/request#3142. Note we didn't get the deprecation warning in dev but examined with CHANGELOGs/commits on this package.
  • Affected code (a lot):
    • app.js (TLS certficate ping)
    • libs/githubClient.js (github import/browse) Related to GitHub API Deprecations (repoManager and GH import pending failure) #1705
    • libs/repoManager (github import/browse) Related to GitHub API Deprecations (repoManager and GH import pending failure) #1705
    • controllers/scriptStorage.js (webhook hooks; icon validation)

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Other possible useful ref(s):

• https://github.com/sindresorhus/got#comparison
• https://github.com/emanuelcasco/http-packages-benchmark

Callback compatible APIs:

• https://github.com/postmanlabs/postman-request
• https://git.rootprojects.org/root/request.js.git
• https://github.com/node-modules/urllib (missing cb in http2 instance placeholder according to docs)

Promise/Stream alleged max support:

• https://github.com/sindresorhus/got (See also Consider ES6+ migration #1556 (comment))

async/await / Promise (towards core):

• https://github.com/node-fetch/node-fetch
• https://github.com/grantila/fetch-h2

Node.js compatible API (integration):

• https://github.com/hisco/http2-client
• Implement window.fetch into core nodejs/node#19393