[feat] implement --nowindow flag to display only systray

for some usages, specially with autostart enabled, user might want to
launch only the systray.

this commit implements a simple ``--nowindow`` switch that just avoids
showing the main window for now. in the future, we can have a different
entrypoint that just launches bitmaskd and a minimal systray widget.

I'm not documenting this feature properly since I think this is still
missing some functionality: the ability to switch on and off the vpn,
and the ability to pass the --autostart as a flag to the bitmask
entrypoint.

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