#Adjust brightness of LG UltraFine displays

Based on these three projects:

• https://github.com/velum/lguf-brightness
• https://github.com/unknownzerx/lguf-brightness
• https://github.com/csujedihy/LG-Ultrafine-Brightness

#Changes

• I've added a command line interface in lieu of the curses-based one.
• I also did some (IMHO) code beautification and cleanup.
• Finally, my display control interface happened to have a product ID of 0x9a70 instead of 0x9a40.

#Compilation

$ cmake -B build .
$ cd build
$ make

#Options

usage: ./lgbrightness [OPTION]

  -M, --max          maximum brightness
  -m, --min          minimum brightness
  -u, --up           increase brightness
  -d, --down         decrease brightness
  -v, --version      version
  -h, --help         this message