Fix response handling

[biskweet]

Following

• this issue on the main qBittorrent repository
• and the discussion on this subsequent pull request

Here is the fix for the piratebay search engine. A gist of the code is available here for testing.

Recalling the problem:

API apibay.org returns weird JSON that causes the piratebay search engine to crash when handling its response. If some search results contain " (quotation marks) characters, the server escapes them by replacing " with " HTML entities in order to still provide a syntactically valid JSON response. While this is not incorrect, it would be best if apibay.org returned properly escaped quotes, i.e. using backslashes.

When handling the response data, functions retrieve_url and htmlentitydecode blindly unescape all entities thereby corrupting previously valid JSON. As a consequence, json.loads crashes. For example:

{
  "title": "Ubuntu 22.04.5 LTS ("Jammy Jellyfish")"
}

becomes

{
  "title": "Ubuntu 22.04.5 LTS ("Jammy Jellyfish")"
}

Solution proposed

We no logner use the retrieve_url function -- instead, I created a dedicated retrieve_url function (which is almost a copy-paste of the orignal) that fixes the problem by manually escaping quotes before escaping the rest of the data.

[Chocobo1]

Take a look at the CI. There are errors present.
Also ignore the "line too long" error. I'll turn it off.

[Chocobo1]

@biskweet
Thank you!