avm2: Implement call handler for XMLList

This delegates to the XMLList constructor, just as
the XML call handler delegates to the XML constructor.

core/src/avm2/globals/XMLList.as

@@ -1,5 +1,6 @@
 package {
     [Ruffle(InstanceAllocator)]
+    [Ruffle(CallHandler)]
     public final dynamic class XMLList {
 
         public function XMLList(value:* = undefined) {

core/src/avm2/globals/xml_list.rs

@@ -56,6 +56,19 @@ pub fn init<'gc>(
     Ok(Value::Undefined)
 }
 
+pub fn call_handler<'gc>(
+    activation: &mut Activation<'_, 'gc>,
+    _this: Option<Object<'gc>>,
+    args: &[Value<'gc>],
+) -> Result<Value<'gc>, Error<'gc>> {
+    Ok(activation
+        .avm2()
+        .classes()
+        .xml_list
+        .construct(activation, args)?
+        .into())
+}
+
 pub fn has_complex_content<'gc>(
     _activation: &mut Activation<'_, 'gc>,
     this: Option<Object<'gc>>,

tests/tests/swfs/avm2/xml_class_call/Test.as

@@ -10,6 +10,9 @@
 			trace("From complex string:")
 			trace(complexXML.children().length());
 			trace(complexXML.name());
+			
+			trace("XMLList from string:");
+			trace(XMLList("<p>First element</p><p>Second element</p>"));
 		}
 	}
 }

tests/tests/swfs/avm2/xml_class_call/output.txt

@@ -4,3 +4,6 @@ Some string
 From complex string:
 1
 outer
+XMLList from string:
+<p>First element</p>
+<p>Second element</p>