Fix majority of pixiv++ functionality

[wcx9281]

pagination and previews on all pixiv pages(except main) is working. Accomplished by recreating old html elements from json data, and hiding/removing pixiv generated ones. Fixes download links on image pages (#19 thanks @Barafag )

[BallM4788]

@wcx9281 Search pages are now broken. Can be fixed by adding the following to removeUnwantedElements at line 1929 (proper indentation included for easy copy-pasting):

                TSL.removeNode(doc.querySelector(".popular-introduction-overlay"))
                TSL.removeNode(doc.querySelector("._premium-lead-popular-d-body"))

[yarrmateys]

image pages have changed, the button that shows previews for multi-image ones below the picture no longer appears.

[wcx9281]

should be fixed again

[yarrmateys]

the button that opened all the pictures doesn't seem to be there (it was a gray button that appeared under the preview for multi-image pages on mode=medium, pressing it would inject thumbnails for every image on the same page), and now that i think about it, there's no source link to ugoira archives either, which appeared in the same place under the animation/image. some search pages don't seem to get parsed, like this one https://www.pixiv.net/search.php?s_mode=s_tag_full&word=N2 edit: seems to be tags that have only 1 page.