[javafx] update to JavaFX 13 (#6020)

I know there is a comment somewhere with a workaround to fix when we
bump, but I can't find it right now...

build.gradle

@@ -34,7 +34,7 @@ plugins {
 }
 
 javafx {
-    version = "12.0.2"
+    version = "13"
     modules = [ 'javafx.controls', 'javafx.web', 'javafx.swing', 'javafx.fxml', 'javafx.graphics' ]
 }
 

code/src/utest/pcgen/gui3/dialog/AboutDialogTest.java

@@ -42,16 +42,6 @@ class AboutDialogTest
 	@Start
 	private void Start(Stage stage) throws IOException
 	{
-		/*
-	    TODO Remove once JavaFx is updated to version 13.
-	    This is a temporary fix for https://github.com/javafxports/openjdk-jfx/issues/66.
-	    https://github.com/PCGen/pcgen/pull/5973
-	     */
-	    if (SystemUtils.IS_OS_WINDOWS)
-	    {
-            System.load("C:\\Windows\\System32\\WindowsCodecs.dll");
-        }
-
 		FXMLLoader loader = new FXMLLoader();
 		URL resource = AboutDialogController.class.getResource("AboutDialog.fxml");
 		assert resource != null;

code/src/utest/pcgen/gui3/preloader/PCGenPreloaderTest.java

@@ -40,16 +40,6 @@ class PCGenPreloaderTest
 	@Start
 	private void Start(Stage stage) throws IOException
 	{
-	    /*
-	    TODO Remove once JavaFx is updated to version 13.
-	    This is a temporary fix for https://github.com/javafxports/openjdk-jfx/issues/66.
-	    https://github.com/PCGen/pcgen/pull/5973
-	     */
-		if (SystemUtils.IS_OS_WINDOWS)
-		{
-			System.load("C:\\Windows\\System32\\WindowsCodecs.dll");
-		}
-
 		FXMLLoader loader = new FXMLLoader();
 		loader.setLocation(PCGenPreloader.class.getResource("PCGenPreloader.fxml"));
 		loader.setResources(LanguageBundle.getBundle());