添加 UnifiedResponse 以替代 RestfulResult；重构 RegexUtil。 (#4)

Reviewed-on: http://zhouxy.xyz:3000/plusone/plusone-commons/pulls/4

src/main/java/xyz/zhouxy/plusone/commons/exception/BaseException.java

@@ -45,7 +45,7 @@ public abstract class BaseException extends RuntimeException implements IWithInt
     }
 
     @Override
-    public int getCode() {
+    public final int getCode() {
         return this.code;
     }
 }