* 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
* fix song progress on white backgrounds
* remove yellow from default song backgrounds
* add default album art for generated song images
* update changelog
* optionally include progress bar in generated song video
* update progress bar size/location
* move everything up 10% when song progress is enabled
* add watermark border to song progress bar
* always show accurate progress bar
* lower progress bar to 90% alpha
* update changelog
