PSA: Simple Wi-Fi gateway killswitch that works with OpenVPN config files

PSA: Simple Wi-Fi gateway killswitch that works with OpenVPN config files

I ran into a problem that Windows and OpenVPN were being "too helpful" when
it comes to repairing the actions of my killswitch batch file which
originated 5 years ago from the LiquidVPN's killswitch batch script.

For years, on my circa 2009 desktop, I used a Zaidy-modified killswitch
that worked perfectly with my Wi-Fi USB dongle, but recently, I changed to
an internal Wi-Fi NIC, which screwed everything up because it's too smart.

Being smart, every time I wiped out the gateway with the taskbar-mounted
killswitch icon, Windows would try to be helpful & restore the gateway.

Likewise, with the new Wi-Fi card, even OpenVPN started being helpful, when
it wasn't this helpful with the USB Wi-Fi dongle, by "fixing" the gateway.

The end result was that my killswitch stopped working because both VPN and
Windows were being too helpful in trying to add the gateway back when
removed, but, get this... but only when using the Wi-Fi NIC.

This "helpful gateway repair" didn't happen with the USB Wi-Fi dongle.
I'll post the latest batch script, which explains the problem & solution.
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