feat: Turtle.get_Symbol ( Fixes #19 )

Author: James Brundage

Types/Turtle/get_Symbol.ps1

@@ -0,0 +1,14 @@
+param()
+
+@(
+    $viewX = [Math]::Max($this.Maximum.X, $this.Minimum.X * -1)
+    $viewY = [Math]::Max($this.Maximum.Y, $this.Minimum.Y * -1)
+    "<svg xmlns='http://www.w3.org/2000/svg' width='100%' height='100%'>"
+        "<symbol id='turtle-symbol' viewBox='0 0 $viewX $viewY' transform-origin='50% 50%'>"
+            "<path id='turtle-path' transform-origin='50% 50%' d='$($this.PathData)' stroke='$(
+                if ($this.Stroke) { $this.Stroke } else { 'black' }
+            )' fill='transparent'/>"
+        "</symbol>"
+        "<use href='#turtle-symbol' width='100%' height='100%' />"
+    "</svg>"
+) -join '' -as [xml]