fix: QString cannot directly print non-English (e.g. Chinese)

[XMuli]

and provides direct printing of common QRect types.

This is a

• [ ] Breaking change
• [x] New feature
• [x] Bugfix

I have

• [x] Merged in the latest upstream changes
• [ ] Updated CHANGELOG.md
• [x] Updated README.md
• [x] Run the tests