SwingColorAlphaWidget: Remove import wildcards

Author: frauzufall

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

@@ -36,9 +36,18 @@
 import org.scijava.widget.InputWidget;
 import org.scijava.widget.WidgetModel;
 
-import javax.swing.*;
+import javax.swing.BoxLayout;
+import javax.swing.ImageIcon;
+import javax.swing.JButton;
+import javax.swing.JColorChooser;
+import javax.swing.JDialog;
+import javax.swing.JPanel;
 import javax.swing.colorchooser.AbstractColorChooserPanel;
-import java.awt.*;
+import java.awt.Color;
+import java.awt.Component;
+import java.awt.Dimension;
+import java.awt.Graphics;
+import java.awt.HeadlessException;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
 import java.awt.image.BufferedImage;