tests: Add avm2/sandbox_type_remote test

Verifies the sandbox type of SWFs loaded through network.

tests/tests/swfs/avm2/sandbox_type_remote/Test.as

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+package {
+    import flash.display.MovieClip;
+    import flash.display.Loader;
+    import flash.system.Security;
+    import flash.net.URLRequest;
+
+    // Compile with network enabled
+    public class Test extends MovieClip {
+        public function Test() {
+            trace("Current sandbox type: " + Security.sandboxType);
+
+            var test:Test = this;
+            test.loadSwf("http://localhost:8000/test-network.swf", function():void {
+                test.loadSwf("http://localhost:8000/test-no-network.swf", function():void {});
+            });
+        }
+
+        private function loadSwf(url:String, callback:Function):void {
+            var loader:Loader = new Loader();
+            loader.contentLoaderInfo.addEventListener("complete", callback);
+            loader.load(new URLRequest(url));
+        }
+    }
+}

tests/tests/swfs/avm2/sandbox_type_remote/TestNetwork.as

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+package {
+    import flash.display.Sprite;
+    import flash.system.Security;
+
+    // Compile with network enabled as localhost/test-network.swf
+    public class TestNetwork extends Sprite {
+        public function TestNetwork() {
+            trace("[Network] Current sandbox type: " + Security.sandboxType);
+        }
+    }
+}

tests/tests/swfs/avm2/sandbox_type_remote/TestNoNetwork.as

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+package {
+    import flash.display.Sprite;
+    import flash.system.Security;
+
+    // Compile with network disabled as localhost/test-no-network.swf
+    public class TestNoNetwork extends Sprite {
+        public function TestNoNetwork() {
+            trace("[No network] Current sandbox type: " + Security.sandboxType);
+        }
+    }
+}

tests/tests/swfs/avm2/sandbox_type_remote/output.txt

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+Current sandbox type: localWithNetwork
+[Network] Current sandbox type: remote
+[No network] Current sandbox type: remote

tests/tests/swfs/avm2/sandbox_type_remote/test.toml

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+num_ticks = 2