Changing palette colors via code.

[gerarreal]

Is your feature request related to a problem? Please describe.
I want stages to have semi-dynamic lighting like 3D ArcSys games but since stage lights are difficult I want a more modular solution that affects 8bit sprites for more reasons than lighting.

Examples:

• Stages with a day/night cycle would tint a character's highlights from yellow (day), orange (dusk/dawn) to indigo (night) dynamically.
• Characters under a spotlight would have their dark colors of a palette match their lighter ones, while out of it's vicinity use their dark colors.
• Fighters that flash colors like Eddie/Zato (I couldn't think of anyone else) could flash colors like pre XRD entries. JUS characters with transformations could flash a bit.

Describe the solution you'd like
A palette color changing sctrl, preferably called PalColor or PalIndex with all PalFX features. The sctrl should affect only how a sprite is shown on screen and use the palette index to point at a color.

Preferably, there should be an alpha value that blends between the original and the new color. Optimally the ability to override colors would be appreciated.

In addition, the ability to read the unmodified color of the palette on an index basis and return values like RGB colors and HSV would be great for adjusting colors on the fly.