Improve UX of swapping Ori's texture

[SiriusAshling]

Currently the main issue for the user is that the original textures aren't provided, so changing Ori's texture involves finding the original images yourself somewhere.

This could be improved by putting the default texture into the assets folder, and any edits on that texture would be reflected in game.

I think for some other textures we consider our paths hardcoded? This might be the simplest option, otherwise the settings could have a path pointing to the normal location in the assets folder by default.