a util with gui to batch rename files

first, run "maven clean package" to build the jar

second, run "java -jar target/renamefiles.jar" to start it.

• You can input any characters with the combination of the 3 templates in template box, and click preview to see the changed file name in preview column, then click begin to start real renaming
• For ? of number or alphabet template, choose to use number or alphabet to replace ? in your template.

Support to change the suffix of the files function.