Fix some nullptr dereferences in Audio

Fixes #859
Italian translation: update
Option for tray icon to display user status
Refactored system tray settings in generalform
Checkboxes in settings grayed out when disabled
Merge branch 'pr866'
also testing my signing
warn on can't read file, fixes #860
Attempt to fix #859
Lemmie fix those for you
Link against IOKit
Can't forget CoreFoundation
Global auto-away
Merge pull request #2 from stqism/patch-7

Fixes global autoaway on OS X
Added copyright notices to platform.*
Changed u_int** to uint**
Reorganized platform-dependent code
Auto-away timer check reduced to 1s
Switched places platform name and file name
Added Spanish translation
Sort res.qrc and remove some unnecessary spaces
put tr list in "alphabetical" order
Merge branch 'pr874'