Support new Discord username

[MagicTeaMC]

This pull request...

• Fixes a bug
• Introduces a new feature
• Improves an existing feature
• Boosts code quality or performance

Description

A easy way to support Discord new username(maybe

Purpose

[jagrosh]

I don't like how this is implemented; I think we should add a formatting function somewhere that will handle the logic, and then use the formatted output anywhere we need the username

[MagicTeaMC]

discord will force all user to use new username, so we don't need to check username anymore :)

[jagrosh]

Either way I think it would still be good to make a specific formatting function for usernames. Discrims will still exist for a bit longer (this would be a future-proof solution) and then it becomes easier to make other formatting changes in the future (for example, showing display name instead of username, or showing a combination of them).

[MichailiK]

The new formatUsername utility is missing usage in 2 places:

MusicBot/src/main/java/com/jagrosh/jmusicbot/commands/dj/ForceskipCmd.java

Line 45 in 8457f94

+"** "+(rm.getOwner() == 0L ? "(autoplay)" : "(requested by **" + rm.user.username + "**)"));

MusicBot/src/main/java/com/jagrosh/jmusicbot/commands/music/SkipCmd.java

Line 69 in 8457f94

+ "** " + (rm.getOwner() == 0L ? "(autoplay)" : "(requested by **" + rm.user.username + "**)");