OpenSwitcher 0.8.1

This is mainly a maintenance update to clean up packaging

New features:
* Implements LUT upload for the 3G converters

Fixes:
* Fix inconsistencies in the pyatem package metadata
* Add the pyatem.converters module to the python package
* Clean up old hexdump import
* Make the fixtures path configurable
* Drop Encoding field from desktop files
* Add keywords to the desktop files
* Add GPL license headers to the project files
* Added man pages for the executables