Openswitcher 0.7.0

* Fixed the BMD RLE compressor for quicker still uploads
* Implemented a correct YCbCrA 10-bit colorspace conversion for media
  still uploads
* Support uploading stills over UDP, USB and TCP connections
* Added a background thread for the UDP connection to send ACK packets
  as soon as data has come in
* Implemented the fields and commands for media player control
* Added unit tests for the colorspace conversion and compression code
* Migrated translations to Weblate

* New languages: German, Norwegian Bokmål and Swedish.
* Translation updates in the supported languages thanks to:
  * TheJes
  * Allan Nordhøy
  * Filip Bengtsson

Much thanks for all the translation help.