Added Checkstyle to build process and fixing checkstyle to all com.src.jpexs classes

src/com/jpexs/decompiler/flash/gui/AppDialog.java

@@ -37,14 +37,13 @@ public abstract class AppDialog extends JDialog {
     private ResourceBundle resourceBundle = ResourceBundle.getBundle(AppStrings.getResourcePath(getClass()));
 
     protected Window owner;
-    
+
     /*public AppDialog() {
         View.installEscapeCloseOperation(this);
         if (Configuration.useRibbonInterface.get()) {
             getRootPane().setWindowDecorationStyle(JRootPane.FRAME);
         }
     }*/
-
     public AppDialog(Window owner) {
         super(owner);
         this.owner = owner;