Visually change character based on Genesis Trainer

[SebastienGllmt]

A few people talked about wanting their trainer sprite to represent one of the Genesis Trainer NFTs they own. We already have the art for all of them, so it should be doable if we want to spend time on this

[RadinEth]

People having more than 1 GT should also have the choice of which skin are they going to use.

Also, maybe the frame type could influence the skin as well ?

Here is an example with Common (basic), Uncommon, Epic and legendary:

This is not much, but I think that's still cool.