Fix `/daily` command

[brybrant]

The /daily command is currently broken and always returns the message "Dailies are current unavailable. Try again in a bit"

This is because the daily achievements API endpoint is now deprecated and replaced by Wizard's Vault endpoints:

• Daily Wizard's Vault objectives
• Weekly Wizard's Vault objectives
• Special Wizard's Vault objectives

These new endpoints require user authentication because the tasks depend on the player's selected preference (pve / pvp / wvw - or any combination of these)

Other daily achievements are now on a fixed rotation (see the wiki page on dailies) so these can be hard-coded in a JSON file or something:

• Fractals
• Living World
• Strike Missions
• End of Dragons