Fix some warnings

Author: ctrueden

src/main/java/org/scijava/ui/swing/console/LogSourcesPanel.java

@@ -292,6 +292,7 @@ public Item(LogSource source) {
 			this.node = new DefaultMutableTreeNode(this);
 		}
 
+		@Override
 		public String toString() {
 			String name = source.isRoot() ? "ROOT" : source.name();
 			return name + " " + getLevelString();
@@ -325,7 +326,7 @@ static Level of(int x) {
 					return DEBUG;
 				default:
 					if (x >= LogLevel.TRACE) return TRACE;
-					else throw new IllegalArgumentException();
+					throw new IllegalArgumentException();
 			}
 		}
 	}

src/main/java/org/scijava/ui/swing/console/LoggingPanel.java

@@ -168,7 +168,7 @@ private void initGui() {
 
 		JPopupMenu menu = initMenu();
 
-		JButton menuButton = new BasicArrowButton(BasicArrowButton.SOUTH);
+		JButton menuButton = new BasicArrowButton(SwingConstants.SOUTH);
 		menuButton.addActionListener(a ->
 			menu.show(menuButton, 0, menuButton.getHeight()));
 

src/main/java/org/scijava/ui/swing/console/TextFilterField.java

@@ -119,7 +119,7 @@ private void initPrompt(String text) {
 		prompt.setFont(textField.getFont().deriveFont(Font.ITALIC));
 		prompt.setForeground(changeAlpha(textField.getForeground(), 128));
 		prompt.setBorder(new EmptyBorder(textField.getInsets()));
-		prompt.setHorizontalAlignment(JLabel.LEADING);
+		prompt.setHorizontalAlignment(SwingConstants.LEADING);
 		textField.setLayout(new BorderLayout());
 		textField.add(prompt);
 		updatePromptVisibility();

src/main/java/org/scijava/ui/swing/mdi/SwingMdiUI.java

@@ -60,7 +60,7 @@
  * @author Curtis Rueden
  */
 @Plugin(type = UserInterface.class, name = SwingMdiUI.NAME,
-	priority = Priority.LOW_PRIORITY)
+	priority = Priority.LOW)
 public class SwingMdiUI extends AbstractSwingUI {
 
 	public static final String NAME = "swing-mdi";

src/main/java/org/scijava/ui/swing/widget/SwingChoiceWidget.java

@@ -53,7 +53,7 @@ public class SwingChoiceWidget extends SwingInputWidget<String> implements
 	ActionListener, ChoiceWidget<JPanel>
 {
 
-	public static final double PRIORITY = Priority.NORMAL_PRIORITY;
+	public static final double PRIORITY = Priority.NORMAL;
 
 	private JComboBox<String> comboBox;
 

src/main/java/org/scijava/ui/swing/widget/SwingMessageWidget.java

@@ -44,7 +44,7 @@
  * 
  * @author Curtis Rueden
  */
-@Plugin(type = InputWidget.class, priority = Priority.HIGH_PRIORITY)
+@Plugin(type = InputWidget.class, priority = Priority.HIGH)
 public class SwingMessageWidget extends SwingInputWidget<String> implements
 	MessageWidget<JPanel>
 {