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

Author: StartAutomating

Types/Turtle/Step.ps1

@@ -0,0 +1,26 @@
+<#
+.SYNOPSIS
+    Takes a Step 
+.DESCRIPTION
+    Makes a relative movement.
+.EXAMPLE
+    turtle step 5 5 step 0 -5 step -5 0 save ./stepTriangle.svg
+#>
+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