Games: Add Black Mesa support.

src/games/bm.rs

@@ -0,0 +1,12 @@
+use crate::GDResult;
+use crate::protocols::valve;
+use crate::protocols::valve::{game, SteamID};
+
+pub fn query(address: &str, port: Option<u16>) -> GDResult<game::Response> {
+    let valve_response = valve::query(address, match port {
+        None => 27015,
+        Some(port) => port
+    }, SteamID::BM.as_app(), None, None)?;
+
+    Ok(game::Response::new_from_valve_response(valve_response))
+}

src/games/mod.rs

@@ -61,3 +61,5 @@ pub mod hldms;
 pub mod ror2;
 /// Battalion 1944
 pub mod bat1944;
+/// Black Mesa
+pub mod bm;