main() couldn't hold its own state since cleanup() needed access to it.
Having the state in a class allows QApplication::aboutToQuit to call
into a member function with access to the state.
Data used in logging still needs to be global due to
qInstallMessageHandler not accepting a void* to get back to this.
Set QGuiApplication attributes before constructing Qapplication as required,
by using comma operator to call an initialization function before construction
all members in the member initializer list.
Keep logic largely unchanged, but with a defined destruction order.
Destruction is still abnormal due to QApplication::aboutToQuit forcing
us to do partial cleanup before QApplication returns, since some OSes
will kill qTox before the QApplication returns.
* Pass MessageBoxManager instantiation around instead of relying on a singleton
* Mock MessageBoxManager for unit tests when needed, since they don't have a
QApplication which is required for creating QWidgets
* Remove GUI class, which didn't have a clear purpose
Makes it so that looking back in chat history, you can see which users you were
connected to for any message. Otherwise self client restarts are unseen.
Follows showGroupJoinLeaveMessages setting which defaults to false, so only
users who opt in will see the messages.
Scrap generic numArg handling. It somewhat increases complexity and doesn't
reduce code either.
Similar to how History handles SCHEMA_VERSION. Run separately on global and
personal settings, since some state in global, and personal settings can’t be
done globally since they require the passkey.
Restrict a user from downgrading past the saved settings version, due to
possible compatibility breaks or old qTox versions re-introducing corrupt state
that was already healed.
Pass in new profile state for personal settings rather than relying on settings
file presence because personal settings can be stored in either the personal
settings file or global settings file. This was introduced in
aea9eea8a4 when personal settings were first
moved to their own file.
