Tracking for issues still at old GitLab repository

[chrysn]

Issues open when this repository moved over from https://gitlab.com/etonomy/riot-wrappers/ were not migrated for GitHub's lack of workflow for that, and are tracked there still:

• [ ] 1: Unrelated components should not interdepend
• [ ] 2: I2C: Add acquired type
• [x] 5: LEDs: Switch to switch-hal
• [x] 6: ZTimer: consider using fugit types for durations and points in time
• [x] 8: vfs abstraction violates file system requirements
• [x] 9: Termination: Use stabilized trait
• [x] 10: cstr: Use from core

[chrysn]

The fugit issue is now superseded by the more general issue https://github.com/RIOT-OS/rust-riot-wrappers/issues/112.