Fix some warnings raised by CheckStyle

- Change ordering of 'static', 'final', etc modifiers according to
  the order suggested by JLS.

- Add comments in empty catch blocks for intentionally ignored
  exceptions.

- Add curly braces around if-else blocks.

- Move `catch` to same line as closing brace of preceding `try`
  blocks.

- Wrap long lines.

Note that this change does not fix all instances of the above errors
across the entire code base.

Change-Id: I24bb9649cc5013c249fa5d84e05322a5cdf2ace6

gerrit-gwtexpui/src/main/java/com/google/gwtexpui/safehtml/client/SafeHtmlBuilder.java

@@ -402,7 +402,7 @@ public class SafeHtmlBuilder extends SafeHtml {
     return isElementName(name);
   }
 
-  private static abstract class Impl {
+  private abstract static class Impl {
     abstract void escapeStr(SafeHtmlBuilder b, String in);
   }