Character sheet

Added a new design for the character sheet, which splits the A4 design up into two separate A5 sheets: one for semi-permanant character info like skills, and one for health tracking.

This is an idea that's been on the back burner for ages, but got pushed to the front of the queue by work on a cut-down Rainworld Quickstart — the supplied Quickstart pregen characters will be filled out on the new sheets!