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Changelog update

Third attempt to fix null value error ashpynov#8

Music Keeps Playing Even When Switching Games ashpynov#9

Second attempt to fix null value error ashpynov#8 and Cancelation of …

…loading was improved.

Mute music if Screenshot Visualiser plays video with music.

Crash on fullscreen ashpynov#7

Redesigned Music downloader and fixed ashpynov#5, ashpynov#6

 Added ability to select not only mp3 music files, but flac and ogg a…

…lso (ashpynov#4)

Fixed crash on music finish when no games selected