Summary

• Decouple mouse polling and serial packet generation functions so mouse polls at 100Hz but packets send at the baud rate.
• Add baud rate set command selection. Remove hardcoded config file option for baud rate due to this.
• Added modes: Inactive, Point, Up/Down.
• Added Output Status request.
• Remove duplicate code and optimize a bunch.

Checklist

• Closes #xxx
• 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/