Fix category edit.

Add Edit Role route.

Add badge ID.

Members: Assign / un-assign multiple roles.
Servers: Routes to set permissions.

Server: Add role create / delete route.

Feature: Roles and group permissions. (server-side)

Web Push: Send events if mentioned

Servers: Add VoiceChannel.

Messaging: Allow multiple attachment upload.

Fix: Don't serialize None on Metadata. (january embed)

Was conflicting with invite-only rauth registrations.

API: Return members when fetching messages.
Misc: Remove defunct DISABLE_REGISTRATION variable.

Permissions: Small fix, consider self as User.

Prevent removal of self / owner.

ban list.