This collects various updates to more closely reflect the official
printed character sheet, specifically:
* use a styled background
* display diamond checkboxes for common skills and skill groups
* format and style experience, valour and wisdom in top right of sheet
* use a serif font
Additionally, internationalisation support is improved:
* switch the logo to display correctly for different language versions
* support migrating from 'Der Eine Ring' and 'Anneau Unique' sheets
Nathanael Winget