Enhancement: Invert all palette colors (negative effect)

[Kraken74]

Keyboard shortcut to invert all colors on the palette.
Proposed Shortcut: CTRL + I (i for invert! Genius!)

For each of the 64 colors:

• Red: 255-current R value
• Green: 255 - current G value
• Blue: 255 - current B value

So white RGB 255,255,255 becomes black RGB 0,0,0.

Reason for this. I have some frames in the AFM UFO Explosion animation that are simply negatives of already colorized frames. Probably something that will not be encountered very often but it has its uses. Otherwise, I will need to go through each color and manually adjust the inverted RGB values (64x3=192 calculations & adjustments per frame).

Low Priority, but on my wish list.

[Kraken74]

Closed the issue as this was most likely only useful for the AFM ROM. I went with greyscale instead of negative colors.