Add genesi studio parser

[gamebeaker]

@dteviot reference: #1423

I have a problem:
I set the Chapterlist links to the api links e.g.: https://genesistudio.com/viewer/6213/__data.json
and in findContent() i want to extract the content from the json response but at the moment it fails i think the problem is that it is not valid html is there a solution for this problem?
A "hack" would be i set the links in Chapterlist to a valid HTML page e.g. https://genesistudio.com/viewer/6213 and than in the function findContent()
let data = (await HttpClient.fetchJson(dom.baseURI + "/__data.json")).json;
but i don't think this is the right approach.

[gamebeaker]

@dteviot i think i got it i overload async fetchChapter(url) i got inspiration from here: https://github.com/dteviot/WebToEpub/blob/ExperimentalTabMode/plugin/js/parsers/InoveltranslationParser.js#L53

[gamebeaker]

It works :)
Tested with:
https://genesistudio.com/novels/yar
https://genesistudio.com/novels/nw

[dteviot]

@gamebeaker

Wow. Thank you for your hard work.

@dteviot i think i got it i overload async fetchChapter(url) i got inspiration from here: https://github.com/dteviot/WebToEpub/blob/ExperimentalTabMode/plugin/js/parsers/InoveltranslationParser.js#L53

That's the way I would do it.

Please note, you can't assign to innerHTML in a Firefox extension. The automated checker won't accept it, because it can't validate the HTML is safe. I've pushed a correction. And taken the liberty to refactor titleFormJson() and findCoverImageUrl()
cf458e0

Tested with:

• https://genesistudio.com/novels/yar, prolog and chapter 1