WIP: feat: Character sheet for v2

[wyrmisis]

Intent

This changeset represents my proposal for a way to build UI elements for the new v2 character sheet.

Of note: it makes use of the Custom Element spec and constructed stylesheets to encapsulate functionality and styling in components.

Please, please, please chime in on this. It's nowhere near done, and that's intentional; I want to get feedback on this approach, because it very much is not something the Foundry dev community uses (outside of stuff like tagify).

What's left?

• Combat tab
  • Displaying AC/AAC per user config
  • Changing fields in the top section of the sheet
  • As Hireling
  • As Advanced Fantasy user
  • Add %bonus to the XP field
  • Add favorite items/abilities functionality
  • All "click to roll" functionality
• All of Abilities tab
• All of Inventory tab
• All of Magic tab
• All of Notes tab

[wyrmisis]

Closing in favor of #479