- Custom features
  - CustomFeature basically a CharacterSheetSection
  - belongs_to character_sheet_section becomes polymorphic
- Lists
- request invite
- improve dice roll parsing to allow e.g. choose highest
- Easy add amount to stat
- icons on features
- auto save text fields
  - indicate save status on titlebar
- Character avatars
- default avatars
- add uuid/slug to characters and any other url-visible ids
- shared/private notes
- NPCs
- Character sheets prototypes
- notifications
- chat
- maps
- show errors from invalid sheet bits