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Improve control codes for locking shifts (LS)
See https://vt100.net/docs/vt510-rm/LS.html
Checklist
- [x] LS1 / SO (0x0E)
- [x] LS0 / SI (0x0F)
- [ ] LS2
- [ ] LS3
- [ ] LS1R
- [ ] LS2R
- [ ] LS3R