[server] join game after relogin

src/client/haxe/ru/m/display/DisplayObjectContainerExtender.hx

@@ -0,0 +1,14 @@
+package ru.m.display;
+
+import flash.display.DisplayObject;
+import flash.display.DisplayObjectContainer;
+
+class DisplayObjectContainerExtender {
+
+    public static function removeChildSafety(self:DisplayObjectContainer, child:DisplayObject):DisplayObject {
+        if (self.contains(child)) {
+            return self.removeChild(child);
+        }
+        return null;
+    }
+}