Controls for the interactive app in pal_main.c

ESC - shutdown

q - increase black point
a - decrease black point
w - increase white point
s - decrease white point
r - reset CRT settings (brightness, saturation, contrast, black point, white point)
f - increment field number
e - toggle between progressive and interlaced mode
t - (in non-NES mode) toggle raw display mode
m - toggle fading phosphors
g - toggle scanlines
b - toggle field blending
k - change between amounts of chroma lag, (-8 -> 8)

SPACE - (in non-NES mode) toggle color

up arrow - increase brightness
down arrow - decrease brightness
right arrow - increase contrast
left arrow - decrease contrast

1 - decrease saturation
2 - increase saturation
3 - decrease noise (minimum 0)
4 - increase noise
5 - decrease color artifacting hue (mod 360)
6 - increase color artifacting hue (mod 360)
7 - switch between color phase error amounts (0, 1, 2)
8 - toggle chroma correction (Hanover bar suppression)
