Build character customiser, with a pixi renderer in the window.

[chrismdp]

To do this properly requires us to choose an art style (see #4) and build a set of initial assets. To do that I need an artist, and I think I'd like to be further along before involving someone.

However, for now I can allow people to choose hair and skin colour I think, from our main palette.

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• Hair colour customiser
• Skin colour customiser
• Eye colour customiser
• House trait fix