Summary

• New character device API
• Character device API implementation for serial
• New serial devices on top of the new API
• Migration of the existing serial passthrough system to the new serial devices

Checklist

• Closes #xxx
• I have tested my changes locally and validated that the functionality works as intended
• I have discussed this with core contributors already
• This pull request requires changes to the ROM set
  • I have opened a roms pull request - https://github.com/86Box/roms/pull/changeme/
• This pull request requires changes to the asset set
  • I have opened an assets pull request - https://github.com/86Box/assets/pull/changeme/

References

This 16550 clone datasheet and a bit of help from the Text Generators(tm) (no generated code was used)