Don Schoeman

This is an initial PR for Issue #70 and handling of frame errors in general.

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This PR consists of the following and I'd like us to discuss it so that it can perhaps be fully implemented if everyone is happy with the way it works:...

When disconnecting a client, e.g. `$client->disconnect()` or `$channel->close()` the `client` property is unset in the `onFrameReceived()` function in `Channel.php`, [see here](https://github.com/jakubkulhan/bunny/blob/d0dec8fbbac4e4edd6cdc892fe14cfa607c386ce/src/Bunny/Channel.php#L590). This causes the exception below when subsequent calls are...

Fix/php81

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Hi, I am concerned about the future of this repository and through this pull request I'm hoping to get the library up to PHP 8.1's standard and compatibility. Some notes:...

Was issue #313: preventOverlapping for distinct tasks ever implemented?

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**Description** I looked at issue #313 `preventOverlapping for distinct tasks` and there was a commit made by the author of the issue ([f16fab5](https://github.com/archonia/crunz/commit/f16fab5a45db26f9748bc65888880dc8a50ab6f3)) on his own fork that seemed to...