Change the video CRF minimum to be 0

Closes #72
Visual Studio removed these for no reason
Constrain audio bitrate

Closes #68
Only verify audio bitrate if the user input one

durr
Constrain video bitrate in automatic mode

Closes #73
Handle the Delete key in TimeSpanBox

Closes #70
Print ffplay output to the console in debug builds
Bump version

[skip ci]