[view] add fullscreen button

src/haxe/ru/m/Device.hx

@@ -1,5 +1,8 @@
 package ru.m;
 
+import flash.display.StageDisplayState;
+import flash.Lib;
+
 enum abstract Platform(String) from String to String {
     var ANDROID = "android";
     var LINUX = "linux";
@@ -48,4 +51,15 @@ class Device {
         return false;
         #end
     }
+
+    public static var fullScreenSupport(get, never):Bool;
+
+    public static function get_fullScreenSupport():Bool {
+        return Lib.current.stage.allowsFullScreenInteractive;
+    }
+
+    public static function toggleFullScreen():Void {
+        Lib.current.stage.displayState = Lib.current.stage.displayState == StageDisplayState.NORMAL ?
+        StageDisplayState.FULL_SCREEN_INTERACTIVE : StageDisplayState.NORMAL;
+    }
 }