Fix ProKeys for YT live chat, Zoho, Wordpress

[GaurangTandon]

Verified unfixed:

• [ ] - YouTube live chat - confirmed 3jun2019 - doesn't work. Similar to FB problem. Snippet abbreviation gets sent instead of expansion, and typing anything more causes placeholder text to overlay.
• [ ] - Zoho (as per uninstall form report) - verified 3rd June'19, doesn't work in description field (link) - rest of the things work
• [ ] - Wordpress blog services (as per uninstall form report) - verified 4Jun'19 - it doesn't work in the blog editor. But I doubt anyone is really using ProKeys in there? (link)
• [ ] LiveChatInc - via email

Fixed/Unverified/Unknown:

• [ ] - ~~Xero (as per uninstall form report)~~ - checked 4Jun'19 - doesn't have a proper textbox anywhere
• [ ] - ~~Polymer app (what does that even mean?) (as per uninstall form report)~~ - can't figure out what it is
• [x] - Chrome webstore support page (03/Mar/17)
• [x] - ~~https://demo.phpmyadmin.net/master-config/~~ uses Codemirror for sql queries, and no other textboxes found
• [x] - forums grandstream (03/Mar/17)
• [x] - Visual Studio Team Services or Team Foundation Server.
• [ ] - ~~Advanced Editor for Education Perfect (uninstallation form)~~ - cannot verify as only accessible to teachers

[GaurangTandon]

@iWrote Try fiddling around with https://demo.phpmyadmin.net/master-config/ I cannot find any textareas at all to insert snippets anywhere :/

[GaurangTandon]

FOUND: http://stackoverflow.com/questions/11613371/chrome-extension-content-script-on-https-chrome-google-com-webstore We can't insert scripts/css in webstore page.

---

Note for chrome webstore: After adding necessary console.logs in the files, it is observed that on clicking brb in context menu:

1. background.js correctly detects the tab and sends out a request.clickedSnippet for detector.js
2. But. detector.js is NOT receiving the message from bg.js

And on executing brb though hotkey,

1. no snippet is executed.
2. prokeys-cached-node property is NOT set on the textarea.
3. even though the textarea is NOT nested inside any iframe, key down events don't seem to being detected. (HAVE TO CONFIRM)

Suspicious characters: there's a hist-iframe at the very top for some unkown reason.

[GaurangTandon]

Setup: for vscode Validated 3Jun19: works pretty flawlessly across all of Overview, query, or boards.

[GaurangTandon]

I do not think this is very high priority anymore