Expand the Actor and Item source field to contain more structured data

[aaclayton]

Suggest that the Source field which is currently a string field be expanded to be displayed read-only on the sheet with a configuration cog to open a mini config app for the source. Properties of the source configuration would be:

Source Data

• Book (optional, a select input populated with a configured list of known sources)
• Page (optional, a string in case some page numbers are non-numeric like "Appendix I")
• Custom (optional, a custom string which overrides Book and Page)
• UUID (optional, a UUID which represents an upstream source of the data flags.core.sourceId)
• Creative Commons (boolean, a checkmark to keep track of content which is has a creative commons license. Alternatively a license dropdown field if we wanted to support multiple options like CC, OGL, ORC, custom etc...)

Module Extensibility

3rd party modules like "Tome of Beasts" or "Flee Mortals" could register themselves to DND5E.CONFIG.SOURCES in order to appear in the Book dropdown.

Benefits

• Present source references in a standardized format
• Useful for content creators building adventures with imported data to customize content sources for custom import behaviors
• Useful for filtering content in a future compendium browser UI to identify content from a particular book
• Licensing rights are important and the future of D&D may involve pretty mixed content with CC/SRD/ORC/Unlicensed all in play

Data Migration

The data migration to support this would be relatively easy. The current source string would be migrated to source.custom.