Adjust brightness of LG UltraFine displays

Compiles and works on Ubuntu 16.04 and 18.10

Based on these two projects:

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

Instructions to compile and run

In order to compile this project, you will need g++, cmake, libusb-1.0-0-dev and libncurses5-dev.

Commands to compile

• cd build
• cmake ..
• make

In order to run this program, you need administrator privileges

sudo ./lguf_brightness