First stable release

• Supports Linux, macOS, and Windows.
• Supports filtering files using regular expression, including capture groups.
• Ignores hidden directories and files by default.
• Safe. F2 will not modify any file names until you tell it to.
• Detects potential conflicts such as file collisions, or overwrites.
• Supports recursive renaming of both files and directories.
• Supports using an ascending integer for renaming (e.g 001, 002, 003, e.t.c.).
• Supports undoing an operation from a map file.
• Extensive unit testing.