feat: Turtle.js.polygon ( Fixes #319 )

Self referencing

Author: StartAutomating

Turtle.types.ps1xml

@@ -8515,10 +8515,12 @@ param()
       </NoteProperty>
       <NoteProperty>
         <Name>polygon.js</Name>
-        <Value>function polygon(size, sides = 6) {    
+        <Value>function polygon(size = 42, sides = 6) {
+    let $this = this
     for (let side = 0; side &lt; sides; side++) {
-        turtle.forward(size).rotate(360/sides)
+        $this = $this.forward(size).rotate(360/sides)
     }
+    return $this
 }</Value>
       </NoteProperty>
       <NoteProperty>