Improve D-Bus implementation on macOS

Better patch to replace !218 (closed).

• Auto and quick detection of previous D-Bus instance;
• Remove private D-Bus compile definition, only use it on macOS without an existing D-Bus instance;
• Safe reboot after crashes because the indicator is not relating on the kdeconnectd to run a D-Bus session;
• Safe exit after clicking on Quit in the systray.

More details in commit logs:

Only enable private D-Bus on macOS because the other platforms do not need them. The app should be able to easily detect the session bus from the env DBUS_LAUNCHD_SESSION_BUS_SOCKET from launchd through launchctl. Because https://gitlab.freedesktop.org/dbus/dbus/-/blob/master/dbus/dbus-sysdeps-unix.c#L4392 shows that it is the only probing method on macOS with launchd.

The D-Bus session bus can be easily found from launchd/launchctl with DBUS_LAUNCHD_SESSION_BUS_SOCKET env. It can be an external one (installed from HomeBrew) or an internal one (launched by a previous instance followed by a crash).

The indicator helper on macOS can now automatically detect whether we can use a potentially (with launchd/launchctl env set, or KDE Connect macOS private_bus_address set) existed and usable session bus. If previous bus is usable, just try to launch the kdeconnectd with us. Otherwise, launch a private D-Bus daemon, export the launchd/launchctl env, and run a kdeconnectd instance.

Everything works better and quicker now :)