Voice Bridge for e4mc

Updated for Minecraft 26.3.

• Voice is handled as soon as it arrives instead of waiting for the next game tick or frame, so lag on either side no longer holds it up.
• The host's own voice now uses normal UDP instead of going through the bridge.
• New setting in config/e4mc_voice_bridge.properties: bridge=auto (default) only uses the bridge for players joining through e4mc, always uses it for everyone with the mod, never turns it off.
• Players who join through e4mc with Simple Voice Chat but without this mod get a chat message telling them to install it.
• /e4mcvoice status now needs operator permissions.
• Fixed an error in the log when leaving a world, plus a few smaller connection cleanup fixes.