Fixed #1195 this keyword in functions outside class

libsrc/ffdec_lib/testdata/as3_new/obj/as3_newConfig.old

@@ -16,7 +16,7 @@
     </define>
     <define append="true">
       <name>CONFIG::timeStamp</name>
-      <value>'07.02.2021'</value>
+      <value>'08.02.2021'</value>
     </define>
     <define append="true">
       <name>CONFIG::air</name>

libsrc/ffdec_lib/testdata/as3_new/src/Main.as

@@ -6,6 +6,7 @@ package
 	import tests_classes.mypackage1.SetupMyPackage1;
 	import tests_classes.mypackage2.SetupMyPackage2;
 	import tests_classes.mypackage3.SetupMyPackage3;
+	import tests_classes.TestThisOutsideClass;
 	
 	/**
 	 * ...
@@ -79,6 +80,7 @@ package
 		TestSwitchComma;
 		TestSwitchDefault;
 		TestTernarOperator;
+		TestThisOutsideClass;
 		TestTry;
 		TestTryIf;
 		TestTryReturn;

libsrc/ffdec_lib/testdata/as3_new/src/tests_classes/TestThisOutsideClass.as

@@ -0,0 +1,18 @@
+package tests_classes
+{
+	
+	public class TestThisOutsideClass
+	{
+		public var attrib : int = 0;
+		public function run():void
+		{
+			helperFunc.call(this,"hello");
+		}
+	}
+}
+
+function helperFunc(a:String): void
+{
+	trace(a);
+	this.attrib++;
+}