Add Site mvlempyr

[ImLJS]

Solves Issue #1568

One of the weirdest sites.

Notes:

1. Each Novel has a slug which is used to get the Novel Id, Chapter Count but don't know from where slug is being created. Had to take the slug from image source. This api call sometimes fail. So, had to use again chapter count div to get it
2. API call to get Chapter URL always give 404 for some reason. No time to check.

API Call to get ID : https://chp.mvlempyr.net/wp-json/wp/v2/tags?slug=6062 => {"id": 2021, "count": 190} and more
API Call to get Chapters : https://chp.mvlempyr.net/wp-json/wp/v2/posts?tags=2021&per_page=500&page=1 => Gives JSON error

@dteviot can you check

Code is working fine but is there any better implementations?

[gamebeaker]

@ImLJS The "problem" is that the index Chapter names are Chapter 1/2/... and not the real name.
Example: https://www.mvlempyr.com/novel/my-house-of-horrors

WebToEpub/plugin/js/parsers/MvlempyrParser.js

Lines 17 to 23 in cadde68

	for (let i = 1; i <= chapterCount; i++) {
	let link = `https://www.mvlempyr.com/chapter/${slug}-${i}`;
	chapterList.push({
	sourceUrl: link,
	title: `Chapter ${i}`
	});
	}

If you change line 21 to:
title: "[placeholder]"
WebToEpub will change the [placeholder] to what findChapterTitle() found.
You can test it manually:

It looks like this:

@ImLJS your decision if you want to change it.