Add support for controlling Windows monitor brightness from Plover.
Monitor brightness is a value between 0 and 100. You have three available commands to manipulate this brightness: BRIGHTNESS_SET, BRIGHTNESS_UP, and BRIGHTNESS_DOWN.
{PLOVER:BRIGHTNESS_UP}
Increase brightness by 10 points.
{PLOVER:BRIGHTNESS_UP:20}
Increase brightness, specifying 20 points.
{PLOVER:BRIGHTNESS_DOWN}
Decrease brightness by 10 points.
{PLOVER:BRIGHTNESS_DOWN:20}
Decrease brightness, specifying 20 points.
{PLOVER:BRIGHTNESS_SET:50}
Set brightness to half.