Rework plugin permission system

[RedMser]

Right now, a plugin's index.js defines defaultPermission, and the server owner can enable/disable plugins individually for everyone or admin.

Proposal

• Create the following default groups (optional maybe more):
  • Admin (only Discord server admins by default)
  • Moderator (only Discord server admins by default)
  • Everyone
• Plugin authors define their own permissions (can be as specific as per-command, or as broad as 'Server management', 'Fun', ...)
• A permission is by default associated to one of the above groups
  • Optional (if it's ez): a permission can also copy/inherit the group of another permission. So we could have broad permissions which by default toggle many fine-grained ones, but can also be disassociated and specified in precision if wanted. Could show it as a hierarchical structure, too.
• Each server owner can change the group of a permission to deviate from the defaults
• Server owner can also create new groups, or edit the roles/users of the default groups (same UI as the current plugin permission system uses), in case the defaults are not fine-grained enough

[Blatoy]

Another idea that we could investigate:

For plugin devs

• Can define custom categories at the top of the file
  • Each category is assigned a default permission level (Owner, admin, mods, members, everyone)
  • Each category has a name
• Can assign a category to each command
  • No categories => "default" category

Permission levels

• "Owner" makes it usable only by bot owners
• "Admin" makes it usable only by guild admins
• "Mods", "Members", "Everyone" can be set up by the guild admin
• (Ability to create custom ones for a guild admin?)

For admins

• Can override default permission for categories / per command (can not set permission to "owner")
• Can add discord roles / users that are allowed to use a category / command
• Commands / categories that are set to "owner" are not visible / editable

For owner

• Can set a category / command to be "owner only"
• Can set a category / command that was by default "owner only" to "manageable by admins"
• Can only use owner commands in a server in which he is admin or in PM
• Can disable categories / commands?