Joinremove

[Birdulon]

Description

Fixes targeting on join and remove commands.
Fixes a logic error on remove: command expected an ascending series of digits and produced incorrect results when fed anything else, e.g.:
/remove 3 3 3 3 makes it remove position 3 four times, removing positions 3-6.
This fix prevents non-unique arguments from being handled, and sorts arguments descending instead of reversing the order.

Aside: the commands could use more feedback on them to indicate command success, and perhaps join could specify which avatarId failed and add all the valid ones instead of the current behaviour. Perhaps @lsCoding666 would like to follow up on that?

Issues fixed by this PR

Type of changes

• Bug fix
• New feature
• Enhancement
• Documentation

Checklist:

• My code follows the style guidelines of this project
• My pull request is unique and no other pull requests have been opened for these changes
• I have read the Contributing note and Code of conduct
• I am responsible for any copyright issues with my code if it occurs in the future.