feat(app): add network game mode

src/common/haxe/ru/m/SignalUtil.hx

@@ -0,0 +1,18 @@
+package ru.m;
+
+import hw.signal.Signal;
+import promhx.Deferred;
+import promhx.Promise;
+
+class SignalUtil {
+  public static function next<T>(signal:Signal<T>):Promise<T> {
+    var d:Deferred<T> = new Deferred<T>();
+    var receiver:T->Void;
+    receiver = (value:T) -> {
+      signal.disconnect(receiver);
+      d.resolve(value);
+    };
+    signal.connect(receiver);
+    return d.promise();
+  }
+}