Research how palettes are applied exactly by the client

[rdw-software]

From my notes (source unknown):

Palettes are applying on the pixel shader to avoid having to re-build each sprite image (faster and easier).

This issue should remind me to consider the following questions:

• What is the source?
• Is this actually true?
• If yes, can it be verified (in the client)?
• Is it relevant and should be noted somewhere in this repository?