Add Ice Box track-only configuration

[LightWayUp]

• Page: https://coolapk.com/apk/com.catchingnow.icebox

Ice Box uses CoolApk as one of several official distribution channels. CoolApk is a popular app store/marketplace in China, where Google services aren't easily accessible.

Relates to #145

---

About track-only

CoolApk app details page contains static download links, in the format

https://dl.coolapk.com/down?pn=com.catchingnow.icebox&id=MjAyMTk&h=<alphanumerics>&from=click

• pn is the package name of Ice Box
• id is probably the ID assigned to the app used internally by CoolApk
• h is a string of alphabet letters and numbers

The h parameter is generated server-side, corresponding to a session identified by cookie SESSID. If the session cookie and the URL parameter are correct, the server will send an APK file, otherwise it'll send an error page with status code 404.

Because Obtainium doesn't use sessions, it loads the page https://coolapk.com/apk/com.catchingnow.icebox and is able to extract a download link, but the download link can't be used to get the APK file when the user presses Install/Update button.

---

If Obtainium is to support downloading from CoolApk and other sites functioning in similar ways, it needs some (likely non-trivial) changes:

• Consider Set-Cookie response header, for the cookies, their domains, paths, and expiry times
• Use the same cookie jar during one round of page scraping and APK download (if the user choose to install or update before the next round of update check happens). Cookie request header needs to be included

[ImranR98]

I don't think it's a good idea to use this site for track-only configs (see #58). Apparently one track-only config already made it in (guess I didn't pay attention) but we shouldn't add more.

Regarding your other comments, you can create an issue on the main Obtainium repo.