Fix Makefile icon dependency and build configuration

- Add logo.ico as dependency to resource compilation rule to ensure icon changes trigger rebuild
- Update .gitignore to exclude Releases directory
- Disable GUI in build configuration

Remove 'by eliboa' attribution from version strings

Version 5.50 is maintained by sthetix. Credit to eliboa remains in
the project README and license files as the original author.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>