feat: Turtle.Step() ( Fixes #161 )

Using `.Step()` in `Forward()` and `GoTo()`

Author: StartAutomating

Turtle.types.ps1xml

@@ -1867,6 +1867,38 @@ foreach ($n in 1..$Points) {
 
                     </Script>
       </ScriptMethod>
+      <ScriptMethod>
+        <Name>Step</Name>
+        <Script>
+                        &lt;#
+.SYNOPSIS
+    Takes a Step 
+.DESCRIPTION
+    Makes a relative movement.
+.EXAMPLE
+    turtle step 5 5 step 0 -5 step -5 0 save ./stepTriangle.svg
+#&gt;
+param(
+# The DeltaX
+[double]$DeltaX = 0, 
+# The DeltaY
+[double]$DeltaY = 0
+)
+
+# If both coordinates are empty, there is no step
+if ($DeltaX -or $DeltaY) {
+    $this.Position = $DeltaX, $DeltaY
+    if ($This.IsPenDown) {
+        $this.Steps += " l $DeltaX $DeltaY"
+    } else {
+        $this.Steps += " m $DeltaX $DeltaY"
+    }
+}
+
+return $this
+
+                    </Script>
+      </ScriptMethod>
       <ScriptMethod>
         <Name>StepSpiral</Name>
         <Script>