[Protocol] GameSpy 1 support with the games Unreal Tournament and Battlefield 1942. (#9)

* Initial files + unreal tournament

* Fix master_querant

* Split by delimiter and collect into hashmap

* Furter port to accept more packets

* Improve getting the server's values

* Some initial players parsing

* Players parsing

* Add error handling

* Add some more fields

* Add Battlefield 1942 support.

* Add query_vars and some docs

src/games/bf1942.rs

@@ -0,0 +1,10 @@
+use crate::GDResult;
+use crate::protocols::gamespy;
+use crate::protocols::gamespy::Response;
+
+pub fn query(address: &str, port: Option<u16>) -> GDResult<Response> {
+    gamespy::one::query(address, match port {
+        None => 23000,
+        Some(port) => port
+    }, None)
+}