Implement custom server listing

[Southclaws]

Favourite lists only show a subset of servers, so a handy feature would be to request only the servers you need via an array of addresses in the /servers HTTP POST body. This would then return only the servers requested but in the same format as the main list.

[BigETI]

I like this idea

An example would be

[
"127.0.0.1:7777",
"111.111.111.111",
"a-samp-server.com"
]