latest release 0.19.6 included a polkit check.
this check is failing in some setups, leading to an unusable experience.
I'm temporarily disabling the check to be able to have an usable release
until we can debug what's causing the issue.

- Related: #152

Before finishing the main thread let's wait for the finish of the
bitmask/pid/... tear down. So the firewall gets down when you ctrl-c.

- Resolves: #142

- Resolves: #141

If bitmask-vpn attempts to connect when there is no internet let's keep retrying
fetching the eip json until internet comes.

- Resolves: #126

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