CC-1977: Allow multiple files to be selected and acted upon in the library and playlist
CC-1977: Allow multiple files to be selected and acted upon in the library and playlist

Fixed the bug where checkbox change events get handled multiple times

Ryex/airtime,LibreTime/libretime,Ryex/airtime,Ryex/airtime,comiconomenclaturist/libretime,radiorabe/airtime,radiorabe/airtime,sourcefabric/airtime,Lapotor/libretime,LibreTime/libretime,thnkloud9/Airtime,sourcefabric/airtime,ReganDryke/airtime,radiorabe/airtime,ReganDryke/airtime,radiorabe/airtime,LibreTime/libretime,sourcefabric/Airtime,Ryex/airtime,sourcefabric/airtime,Lapotor/libretime,justvanbloom/airtime,thnkloud9/Airtime,Ryex/airtime,Ryex/airtime,Lapotor/libretime,LibreTime/libretime,justvanbloom/airtime,sourcefabric/Airtime,sourcefabric/Airtime,sourcefabric/Airtime,sourcefabric/airtime,comiconomenclaturist/libretime,thnkloud9/Airtime,thnkloud9/Airtime,comiconomenclaturist/libretime,justvanbloom/airtime,sourcefabric/airtime,comiconomenclaturist/libretime,justvanbloom/airtime,ReganDryke/airtime,sourcefabric/airtime,radiorabe/airtime,LibreTime/libretime,ReganDryke/airtime,ReganDryke/airtime,comiconomenclaturist/libretime,thnkloud9/Airtime,Ryex/airtime,radiorabe/airtime,thnkloud9/Airtime,Lapotor/libretime,justvanbloom/airtime,justvanbloom/airtime,sourcefabric/airtime,Lapotor/libretime,sourcefabric/Airtime,comiconomenclaturist/libretime,Lapotor/libretime,ReganDryke/airtime,comiconomenclaturist/libretime,sourcefabric/Airtime,thnkloud9/Airtime,radiorabe/airtime,ReganDryke/airtime,LibreTime/libretime,justvanbloom/airtime,sourcefabric/Airtime