When there was no configuration file the 'conf.StartVPN' was set tu
false. Let's set it properly even if there is no config file.

- Resolves: #128

Rename the icon to icon.svg/icon.ico instead of having the name of the
app in it.

- Resolves: #98

this should resolve DNS leaks on windows.

-Resolves: #113

The -start-vpn flag can be set to on or off to turn the vpn on or off
just after launching bitmask-vpn. So it doesn't depend on the status of
the vpn of the last run.

- Resolves: #114

Make possible to disable the autostart configuration for the next run. I
can be done by configuring "DisableAustostart" to true in the
systra.json or by passing the '-disable-autostart' flag to the binary.

To make that possible I have rework how the Config struct work
separating the file configuration with the runtime configuration.

- Resolves: #100

Let's send the notification to another goroutine.

- Resolves: #112

- Resolves: #110

in systems with newer openssl, tls 1.0 has been disabled.
however, this breaks the ability of a client in a newer system to
connect with the openvpn servers on providers that are still on stretch.

platform needs to be upgraded.

-Related: #105

- Resolves: #106

I think there's no need of vendoring this.
The debian package builds fine without them - at least with the text-dev
package in testing.