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)
fix bug (which is actually why aliasing was menu'd in the first place)
update russian translation
add group title menu option, other half of closes #780
also truncate all group titles to max len
Fix zlib link order on windows x64
Update windows installer for x64
Merge branch 'pr804'