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