HOT-fix: restore correct gamemode after auth for first-time players

Players who disconnected mid-login were incorrectly re-set to spectator on rejoin. Fixed by defaulting to survival if no prior gamemode was saved.

Fix coordinates leak vulnerability during authentication

• Enhance player security by teleporting authenticating players to a safe, calculated location at (0,Y,0) instead of keeping them at their join position
• Calculate Y coordinate based on the actual surface height at (0,0) to ensure players are safely above ground
• Detect and remedy situations where a player disconnects during authentication and rejoins, preventing them from being stuck in spectator mode
• Update README to clearly document this security feature

Resolves #5: Coordinates Weakness vulnerability

MAJOR UPGRADE TO 2.0.0

This project was abandoned for a while due to the lack of my own time. Now, the codebase has been COMPLETELY REVAMPED and OPTIMIZED.

Latest update to the safeserver mod, now supporting 1.21, contact me if there's any issues.

Updated for better teleportation accuracy!

Updated for 1.20.6!

SafeServer updated for Minecraft 1.20.5!

Updated code for Operator check logic.

DEPRECATED! THIS VERSION HAS A MAJOR BUG WITH OPERATOR LOGIC, USE THE LATEST VERSION!

Updated to prevent Null Pointer Crashes

Better instructions for first-time users

First Release