[TelegramBridge] Getting posts beyond last page #3874
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Fixes #2084.
Bridge can now fetch previous posts beyond ones displayed on default webpage. This is pretty much a necessity for news aggregator channels with dozens of posts/day.
As the number of posts on a telegram webpage is not constant (I was getting anything from 4 to 20 posts for different channels), the bridge now fetches webpages with "...?before=..." param until post count matches requested number of posts OR the number of fetched pages reaches the hard-limit OR reaching the first post in the channel.
Although I tested the code manually on different channels, I'm very much an amateur programmer and moreover never wrote in PHP before. So sanity-checks would be nice.