* fix validation in new form layout
* pin mediatr to last oss version
* update dependencies
* cleanup code in core
* cleanup code in ffmpeg
* cleanup code in infra
* cleanup code in scanner
* cleanup code in application
* cleanup main code
* cleanup test code
* solution-wide code cleanup
* initial work on maintaining playout state
* debugging wip
* fix refresh playout logic
* fix failing test
* more fixes
* update changelog
* comment out some debug logs
* comment out more logs