feat: Turtle.FontStyle ( Fixes #354, Fixes #379 )

Author: StartAutomating

Types/Turtle/get_FontStyle.ps1

@@ -0,0 +1,13 @@
+<#
+.SYNOPSIS
+    Gets the font style
+.DESCRIPTION
+    Gets the font style of the Turtle, if one has been set.
+
+    If no font style has been set, this returns nothing.
+.EXAMPLE
+    turtle fontstyle italic fontstyle
+.LINK
+    https://developer.mozilla.org/en-US/docs/Web/SVG/Reference/Attribute/font-style
+#>
+$this.TextAttribute.'font-style'

Types/Turtle/set_FontStyle.ps1

@@ -0,0 +1,15 @@
+<#
+.SYNOPSIS
+    Sets the font style
+.DESCRIPTION
+    Sets the font style of the Turtle.
+
+    Any input is acceptable, but it may not be valid.
+    
+    Invalid input will be ignored.
+.LINK
+    https://developer.mozilla.org/en-US/docs/Web/SVG/Reference/Attribute/font-style
+.EXAMPLE
+    turtle fontstyle italic fontstyle
+#>
+$this.TextAttribute = @{'font-style'= $args }