kWidget: Support backtrace in debug mode
kWidget: Support backtrace in debug mode

* Support fullscreen gestures in production mode.

vladm3/mwEmbed,FlixMaster/mwEmbed,alexmilk/mwEmbed,kaltura/mwEmbed,matsuu/mwEmbed,bordar/mwEmbed,joanpuigsanz/mwEmbed,DBezemer/mwEmbed,vladm3/mwEmbed,DBezemer/mwEmbed,FlixMaster/mwEmbed,slash851/mwEmbed,slash851/mwEmbed,matsuu/mwEmbed,abaylis/mwEmbed,kaltura/mwEmbed,safarijv/mwEmbed,safarijv/mwEmbed,FlixMaster/mwEmbed,safarijv/mwEmbed,omridevk/mwEmbed,omridevk/mwEmbed,slash851/mwEmbed,abaylis/mwEmbed,SVSG/mwEmbed,bordar/mwEmbed,matsuu/mwEmbed,slash851/mwEmbed,joanpuigsanz/mwEmbed,alexmilk/mwEmbed,panda-os/mwEmbed,SVSG/mwEmbed,alexmilk/mwEmbed,FlixMaster/mwEmbed,panda-os/mwEmbed,DBezemer/mwEmbed,bordar/mwEmbed,alexmilk/mwEmbed,omridevk/mwEmbed,safarijv/mwEmbed,tanyaLibatter/mwEmbed,panda-os/mwEmbed,SVSG/mwEmbed,vladm3/mwEmbed,joanpuigsanz/mwEmbed,tanyaLibatter/mwEmbed,DBezemer/mwEmbed,kaltura/mwEmbed,vladm3/mwEmbed,omridevk/mwEmbed,kaltura/mwEmbed,abaylis/mwEmbed,bordar/mwEmbed,joanpuigsanz/mwEmbed,tanyaLibatter/mwEmbed,panda-os/mwEmbed,matsuu/mwEmbed,SVSG/mwEmbed,abaylis/mwEmbed,tanyaLibatter/mwEmbed