Allow selection of proxy servers by country/city

[ruihildt]

is it possible, to in the extension, select CONTRY insted of individual server? Servers are changed frequently and it will end in users not haveing access to internet since a server was removed or replaced

[ruihildt]

After confirming with R, we would like to respect weight and country servers exclusions when selecting a country/city.

Here's what Linus had to say about it (He's probably the go to guy if we have questions):

The roulette wheel selection algorithm to pick a relay from the filtered list:
https://github.com/mullvad/mullvadvpn-app/blob/master/mullvad-daemon/src/relays.rs#L632
11:20
And also referenced this: https://github.com/mullvad/mullvadvpn-app/blob/master/mullvad-daemon/src/relays.rs#L312

Currently, we don't have access to weight and country servers exclusions with the API used.

[ruihildt]

The algo has been updated today to support server with a weight of 0, see mullvad/mullvadvpn-app#3262

[ruihildt]

Closed in favor of #113, because this feature is implemented.