Adding a setting to bypass opencpn:s check if gps device is activated

This workaround made it posible to use more then one opencpn on our boat.

There is some kind of comunicatin problem between opencpn and gpsd on out boat.
"if (m_gps_data->devices.list[0].activated < 1.0)" is returned as 0.00 on the remote computer,
and that disables the gps on the remote opencpn, but it still works fine on the localhost opencpn.

whti this patch you can add ForceGPSDActive=1 under [Settings] in the config-file, 
and then opencpn reads the gps-data, even if it dosn't belive there is an active gps.

If you could help me dig deeper and solve this problem, that be nice, 
or at least merge this patch, so others whit the same problems just need to update there config-file