[Core] Add redbot --edit cli flag (replacement for [p]set owner&token)

[jack1142]

Type

• Bugfix
• Enhancement
• New feature

Description of the changes

This PR adds redbot --edit cli flag that allows to edit instance name, token, owner and datapath. It's supposed to be a replacement for [p]set owner and [p]set token that were removed due to being potentially dangerous.

I used the occasion to unify all confirmation prompts in Red's cli commands and also fixed a small bug that allowed user to pass no arguments to --co-owner and --load-cogs

Flags that can be used with redbot --edit:
--no-prompt - disables everything interactive in the command, if it's not passed the command will ask for everything that wasn't passed with other flags
--token - can be used to change token
--owner - can be used to change owner
--edit-instance-name - can be used to change instance name
--overwrite-existing-instance - can be used with --edit-instance-name to allow Red to overwrite existing instance when changing name
--edit-data-path - can be used to change data path
--copy-data - can be used with --edit-data-path to make Red copy data from old data path to new one

This might be considered breaking as I did change function signature for confirm() and interactive_config() that are under redbot.core.cli module but I didn't make changelog entries for that and I'm waiting for response whether I should add changelog entries, make this change non-breaking in that regard or don't change anything at all.

[Malarne]

After a bit of testing, a keyboard interrupt throws this error:
https://media.discordapp.net/attachments/133251234164375552/635226798006861834/unknown.png

[jack1142]

This is now ready for review, I updated the PR description accordingly.

[Cog-CreatorsBot]

Changes requested by Flame#2941

[Kowlin]

Works fine, can't break it.

Stale