Allow basic regex-search in GUI

Full Changelog: 1.3.0...1.4.0

1. Run the app using Java 21, java -jar Bulker-1.4.0-all.jar
2. Drag-and-drop files and/or directories into the field on the left. All files from directories are added recursively.
3. Enter the search-text into Search For in the top left.
4. Enter the replacement-text into Replace With in the top right.
5. Hit the Run Bulk-Rename-button to rename all files which have your search-text in their name.

Include Mask and Exclude Mask are Optional. They are Regexpressions you can use to further fine-trim your renaming and can be left empty.

To run in commandline, without GUI: java -jar .\Bulker-1.4.0-all.jar --search "g" --replace "###" --input "E:\Temp"

--search is the text you want to look for in filenames. The equivalent to Search For in the GUI. Only a single --search when running in CLI.

--replace is the text you want to replace the searched text with. The equivalent to Replace With in the GUI. Only a single --replace when running in CLI.

--input must be the path to a file or directory. Directories are checked recursively. You may specify as many --input as you like.

--include-mask is an optional Regex which acts as an additional filter for file to INCLUDE. If this Regex matches a file, it will be included in the rename-process. If you don't want to use it, ignore this argument.

--exclude-mask is an optional Regex which acts as an additional filter for files to EXCLUDE. If this Regex matches a file, it will be excluded from the rename-process. If you don't want to use it, ignore this argument.