* Explicitly use `network.cloudflareClient` instead of `super.client`
... but only if the parent is `HttpSource` or `ParsedHttpSource`
* Remove use of `network.client`
... replaced with `network.cloudflareClient` or `super.client` if the
parent class sets `client` to `network.cloudflareClient` already.
* Fix page parsing
* Add default function to fall back if the website get back to normal
calling super.pageListParse(response) will cause java.lang.IllegalStateException: closed since response.asJsoup() will be called twice, so resolve to copying the code
