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Upgrade to Minecraft 1.21.3 (not tested on 1.21.2)

Update to Minecraft 1.21

Only update HUD on new header/footer or scoreboard update packet (thanks proffa_)

Allow setting of text scale (size)

Rewrote the formatting string parsing logic to better handle newlines. Now allows for escaping of curly braces.

• Compile regexes less often.
• Remove §s.

Initial release