use GlobalAutoAcceptDir only if autosaving enabled
Merge branch 'pr792'
The showSystemTrayIcon's default value is false for linux else it is false.
Cherry pick pull request #793

Closes #793
Update de.ts

Added some translations.
Merge branch 'pr794'
Vol button: Less blury, use Tox Red when pressed

Helps with #554 and #795
Update Ukrainian translation
Mic button: Less blury, use Tox Red when pressed

Helps with #554 and #795
Call buttons: Use tox red
Merge branch 'pr796'
Widget: Don't delete icon, it's a child
Core update
Put group chats audio playing in its own thread
Fix incorrect HINSTANCE -> int cast
Fix more incorrect HINSTANCE casts
Silence potentially uninitialized warning

Turns out the warning is wrong, but let's initialize anyways
remember status when disconnected (should help with #715)
fix crash if no boostrap nodes (fix #791 where "fix" means "mask the underlying problem")
set aliases from chat form (half of #780)