Add Head-to-Head kill stats

Add basic head-to-head kill analysis and the corresponding matrix display in the UI

analysis/tests/head_to_head.rs

@@ -0,0 +1,40 @@
+use analysis::head_to_head;
+
+use pretty_assertions::assert_eq;
+use std::collections::HashMap;
+
+#[test]
+#[ignore = "Testing"]
+fn head_to_head_nuke() {
+    let path = concat!(env!("CARGO_MANIFEST_DIR"), "/../testfiles/nuke.dem");
+    dbg!(path);
+    let input_bytes = std::fs::read(path).unwrap();
+
+    let result = head_to_head::parse(&input_bytes).unwrap();
+
+    let expected = head_to_head::Output {
+        players: [(csdemo::UserId(0), csdemo::parser::Player {
+            xuid: 0,
+            name: "".to_owned(),
+            team: 0,
+            color: 0,
+        })].into_iter().collect(),
+        head_to_head: [
+            (csdemo::UserId(0), HashMap::new()),
+            (csdemo::UserId(1), HashMap::new()),
+            (csdemo::UserId(2), HashMap::new()),
+            (csdemo::UserId(3), HashMap::new()),
+            (csdemo::UserId(4), HashMap::new()),
+            (csdemo::UserId(5), HashMap::new()),
+            (csdemo::UserId(6), HashMap::new()),
+            (csdemo::UserId(7), HashMap::new()),
+            (csdemo::UserId(8), HashMap::new()),
+            (csdemo::UserId(9), HashMap::new()),
+        ].into_iter().collect(),
+    };
+
+    dbg!(&expected, &result);
+    assert_eq!(result, expected);
+
+    todo!()
+}