Virtualbox

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* Fix bug in VirtualBox API specification where ``VBoxEventType.progress_event`` and
``VBoxEventType.on_cloud_provider_can_uninstall`` are both mentioned but are not valid event types.

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* Added support for VirtualBox 6.1

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* Added support for VirtualBox 6.0:

* Added new Recording features
* Added support configuring network proxies
* Added support for Cloud features
* Added new CPU, Hardware, and Virt property types
* Added new event and error types
* Renamed the PyPI project from ``pyvbox`` to ``virtualbox`` (Installing ``pyvbox`` still works).
* Fixed a bug with streaming output from a console command.
* Dropped explicit support for Python 2.6 and 3.3 (May still work?).
* This is a new major version and many argument and function names have
changed. Version 2.x of this library only supports VirtualBox 6.0+.

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* Fixed `__name__` which made Python 3 installs break.

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* Added ``SettingsVersion.v1_17`` which is written by VirtualBox 5.2.x
* Added ``VirtualBox.create_unattended_installer()``
* Added ``IUnattended`` interface which can be used to create a Guest OS
in a fully automated way. (Doesn't work yet in 5.2 beta)
* Added ``IHostNetworkInterface.wireless`` property which returns
``True`` if the interface is wireless.

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* Searches for vboxapi installed in Anaconda on Windows. (sethmlarson PR 80)
* Added ``__lt__`` and ``__gt__`` methods for orderability on Python 3. (sethmlarson PR 82)