Filter list of servers on combobox input

[QuentiumYT]

Hello, Here I am again with another PR :)

Bored while looking for the server of your country? Now you can search any keyword to filter the server list that matches your search! It is case insensitive to be faster to look at the results.

I hope you will find these changes useful!

[QuentiumYT]

Here's a preview if anyone is interested