Regex Search Expert

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This is a major update with many features added as follows
- Organize menu
- Change default theme
- Replace with capture groups
- Add recent searches option
- Add recent files option
- Ability to specify encoding
- Search in background thread
- Renamed app and changed icon
- Changed overall design
- Ability to input regex flags manually
- Regex input now supports multiple lines
- Change loading design
- Add changelog
- Numerous micro changes
- Bug fixes