New Features
- "Include characters" option: New placeholder "<<...>>:N[+]" allows specifying custom character set (enclosed within <<...>>) and assigning a frequency value N to it (e.g., "<>:1+" ensures that generated passwords contain at least one character from the set "abcd0123")
- Feature "Character Set Builder": New window for composing custom character set strings, which can be copied to the "Character set" box in the main window (press "Build" button below the "Character set" box)