Campaign Code Imports

[jarena3]

Transmit only published campaigns via share code

• [x] modify code length
• [x] generate in campaign publish menu
• [x] track in campaign library
• [x] detect and ask for updates
  • [x] on mount, collect metadata from share codes
  • [x] mark updatable
  • [x] click to download update
• [x] gm published campaigns => campaign collection
• [x] redirect gm campaign collection to compendium