[V3 Core] More features for the bot invite URL

[laggron42]

Type

• Bugfix
• Enhancement
• New feature

Description of the changes

This PR adds a new [p]inviteset group command that allows 3 things:

• Make the [p]invite command available for everyone, so they can invite the bot without asking its owner. However, if the "Public bot" option is not ticked in the token settings, the command will block the action and tell the user to modify it.

• Modify the permission level of the bot. The permission is given with the permission calculator (too complicated to use discord's method and iterate every permission) and it will be added to the bot's invite.

• The ability to add a redirect URL. It will be added to the bot's invite too, and will redirect to a website when the bot is invited.

Warning

This PR is using a new feature that I made, which allows the bot to use the bot_public endpoint (to know if the "public bot" option is enabled or not). A PR is open on discord.py's repo, so please wait for it to be merged before merging this.

The PR : Rapptz/discord.py#1341

If you want to test that feature, do this in a virtualenv:

pip3 install -U --process-dependency-links git+https://github.com/retke/Red-DiscordBot@invite-additions
pip3 install -U git+https://github.com/retke/discord.py@patch-1
pip3 install yarl==0.18.0
pip3 install async-timeout==2.0.1

[laggron42]

My pull request was just merged (actually rebased, but that's the same). This PR is not blocked anymore by discord.py.

[Kowlin]

Has conflict, please fix. Also, is the stuff in the rewrite branch of D.py yet?

[laggron42]

@Kowlin yep, PR is rebased since august. I'll fix the conflicts.