ControlAnimation: palette updates on pause

[MarcelHB]

When playing IWD2 and hitting Pause, then changing into the inventory, the paperdoll's palette is never adjusted, so we see this standing frozen:

UpdateAnimation will always either skip updating or proceed in frames, which is both not fully what is useful here. I reworked that a little in a way that SetPaletteGradients will cause redraw without continuing the animation.

The whole thing has some annoying design, but at least this will stop rainbow colours here.

[lynxlynxlynx]

Thanks, looks pretty clean to me. Any thoughts @bradallred?

[bradallred]

I certainly don't see anything wrong here. seems like any setter ought to update it tho. any harm in adding it to SetBlend?

[MarcelHB]

Maybe, since the only actual use case puts that right in front of UpdateAnimation: https://github.com/gemrb/gemrb/blob/master/gemrb/plugins/GUIScript/GUIScript.cpp#L5539

[bradallred]

Yeah, probably nothing to worry about. I dont know enough about it to make any improvement suggestions so I would say merge it.