v2.18.0 - new permission system

[Taaku18]

Resolves #196 and resolves #165

v2.18.0

What's new?

• A brand new permission system! Replacing the old guild-based permissions (ie. manage channels, manage messages), the new system enables you to customize your desired permission level specific to a command or a group of commands for a role or user.
• There are five permission groups/levels:
  • Owner
  • Administrator
  • Moderator
  • Supporter
  • Regular

You may add a role or user to a permission group through any of the following methods:

• ?permissions add level owner @role
• ?permissions add level supporter member-name
• ?permissions add level moderator everyone
• ?permissions add level moderator @member#1234
• ?permissions add level administrator 78912384930291853

The same applies to individual commands permissions:

• ?permissions add command-name @member#1234
• ... and the other methods listed above.

To revoke permission, use remove instead of add.

To view all roles and users with permission for a permission group or command do:

• ?permissions get command command-name
• ?permissions get level owner

Note

When updating to this version, all prior permission settings with guild-based permissions will be invalidated. You will need to convert to the above system.

Check the changelog for the most up-to-date changes.

[fourjr]

Should be good to go imo, only push after #219 has been merged.