Nxtools

- FFMpeg as submodule
- CasparCG Controller
- ElementTree XML parser (xml function)

- case insensitive extension filtering in get_files
- exception handling in ffmpeg progress handlers
- watchfolder updates, get_size function
- get_guid function

- fixed ffmpeg marking

- to_unicode function
- better slugifier
- ffanalyser refactored, video/audio selection

- encode_if_py3

- ffmpeg analyser
- more stuff