Log all JavaFX runtime errors

Previously they would end up in stdout, which is invisible when the app is installed and running from a launcher.

A requester is also shown since most JavaFX crashes have serious consequences (dead UI, etc...)

ui/src/main/java/io/xeres/ui/JavaFxApplication.java

@@ -21,6 +21,7 @@
 
 import io.xeres.common.mui.MinimalUserInterface;
 import io.xeres.ui.support.uri.UriService;
+import io.xeres.ui.support.util.UiUtils;
 import javafx.application.Application;
 import javafx.stage.Stage;
 import org.springframework.boot.builder.SpringApplicationBuilder;
@@ -65,6 +66,9 @@ public void start(Stage primaryStage)
 	{
 		Objects.requireNonNull(springContext);
 
+		// This allows all JavaFX crashes to show up in the logger instead of stdout
+		Thread.setDefaultUncaughtExceptionHandler(JavaFxApplication::handleException);
+
 		var openUrlService = springContext.getBean(UriService.class);
 		openUrlService.setHostServices(getHostServices());
 
@@ -76,4 +80,9 @@ public void stop()
 	{
 		springContext.close();
 	}
+
+	private static void handleException(Thread thread, Throwable throwable)
+	{
+		UiUtils.showAlertError(throwable);
+	}
 }

ui/src/main/java/io/xeres/ui/support/util/UiUtils.java

@@ -118,14 +118,14 @@ public static void showAlertError(Throwable t, Runnable action)
 			}
 			else
 			{
-				alert(ERROR, "Error", t.getMessage(), ExceptionUtils.getStackTrace(t));
+				alert(ERROR, "Error", t.getClass().getSimpleName() + ": " + t.getMessage(), ExceptionUtils.getStackTrace(t));
 			}
 			if (action != null)
 			{
 				action.run();
 			}
-			log.error("Error: {}", t.getMessage(), t);
 		});
+		log.error("Error: {}", t.getMessage(), t);
 	}
 
 	public static void showError(Node... nodes)