Support customizable skins

[GoaLitiuM]

I'm still open to how to pull this out. Use Lua which would offer maximum customizability? HTML/CSS? Javascript? Any other ideas?

[DolphinDTM]

I think using lua would be a good idea as it could contribute to making lua the "standard" for skins, so that people can easily write new skins for different games, even if the implementation is different.