Vncdotool

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- fixes for api.shutdown and disconnect raise exceptions, 256

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Huge thanks to pmhahn for single handedly driving conversion to modern Python3, as well
as cleaning up a ton of outstanding issues.

- [BREAKING] drop python 2.x support, thanks pmhahn
- Use built-in Unittest and mock for testing
- PEP-484 type hinting, thanks pmhahn
- Doc improvements, thanks luke-jr, pmhahn, samiraguiar
- Test for byte handling, thanks ponty, refs 177
- Internal implementation of DES replaced by PyCrotodomeX

- Support for Apple Remote Desktop (ARD), thanks andywgrant, pmhahn
- Support for pseudo-encoding LastRec, thanks pmhahn
- Support for Extended QEMU Key Events, thanks pmhahn
- Support IPv6 addresses for server connection, thanks pmhahn

- Bugfix, use configured log outputs over stdout, thanks pevogam
- Bugfix, handle invalid password, thanks dozysun
- Bugfixes for loggingproxy, thanks joachimmetz, pmhahn, guicho271828

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- add ZRLE encoding, thanks Adrian Weiler
- drop python2 support
- fix mouseDrag behaviour, thanks Samir Aguiar

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- new flag --incremental-refreshes, increased compatibility of capture, thanks Amir Rossert
- exit non-zero and print to stderr for unknown commands, thanks Amir Rossert

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- bugfix expectRegion to use cropped images for compare, thanks Michael Fürnschuß
- direct support for building RPMs, thanks Plamen Dimitrov

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- connect via UNIX sockets, thanks Matteo Cafasso
- bugfix, XTightVNC initial connection, thanks Antti Kervinen