Integrate Sentry for crash logging.

Cargo.toml

@@ -33,4 +33,5 @@ mapgen = "0.5"
 maze_generator = "1"
 pathfinding = "2"
 rand = "0.8"
+sentry = "0.23"
 shadowcast = "0.8"

src/error.rs

@@ -44,10 +44,21 @@ fn init_panic_handler() {
     }));
 }
 
+#[derive(Clone, Debug, Default)]
+pub struct ErrorConfig {
+    pub sentry_dsn: Option<String>,
+}
+
 pub struct ErrorPlugin;
 
 impl Plugin for ErrorPlugin {
-    fn build(&self, _: &mut AppBuilder) {
+    fn build(&self, app: &mut AppBuilder) {
         init_panic_handler();
+        if let Some(config) = app.world().get_resource::<ErrorConfig>() {
+            if let Some(dsn) = &config.sentry_dsn {
+                let guard = sentry::init(dsn.clone());
+                app.insert_resource(guard);
+            }
+        }
     }
 }