[FEATURE] AltManager's improvements in supporting IDs.

[mumy-255]

LiquidBounce Branch

Nextgen

Describe your feature request.

AltManager does not support adding or logging in with IDs that are not composed of letters, numbers, or underscores.
But in reality, there's no issue with AltManager supporting these IDs; otherwise, it would limit its use cases.

Additional context

[polyromanticasexual]

The limit is that Minecraft does not support non-ASCII characters in usernames, and 99.9% of servers have checks to see if usernames contain any of the characters not allowed by the Alt Manager.

[mumy-255]

The limit is that Minecraft does not support non-ASCII characters in usernames, and 99.9% of servers have checks to see if usernames contain any of the characters not allowed by the Alt Manager.

The situation in China is quite different. In the Chinese version, 99% of servers support Unicode player IDs, with even 10% of offline servers supporting them. Therefore, this restriction doesn't benefit the situation there.