style selector

Unfortunately Qt developers removed some old native skins from support, only 3 skins are supported on Linux.
Number of native skins depends on OS and Qt built system.
Merge remote-tracking branch 'upsteam/master' into style
status changes messages and sign in notifications

sign in notifications available only in settings and as a message in chat
renamed function
number of messages is more reliable then activities
cleanup "sign in change", since it's unnecessary
Merge branch 'pr422'
fix for #442
Merge branch 'master' of https://github.com/tux3/qTox into style
Merge branch 'pr444'
fixes regression sent by apprb
Merge branch 'pr446'
UI for autoaway
set idle timer in widget.cpp
s/min/minutes/
Merge branch 'pr447'
buildPackages.sh : Don't rebuild libsodium everytime
buildPackages.sh : Don't use --local bootstrap
Debian: Update package dependencies
VideoSurface: aspect ratio