Ploy-fabric

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* Dropped support for Python < 3.7.
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* Added support up to Python 3.10.
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* Pin to Fabric < 2dev.
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* Drop Python 3.4 support.
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* Support Python 3.x via Fabric3.
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* Support for ploy 2.0.0.
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* Update requirements to block Fabric >= 2 as it isn't compatible.
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* Require Fabric >= 1.4.0 and vastly simplify the necessary patching.
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* Close all newly opened connections after a Fabric call.
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* Add context manager and decorator to easily switch fabric connections.
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* Added documentation.
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