FastMineCartsCombined

• Switched from velocity based movement to vanilla maxSpeed control • More realistic minecart acceleration and speed feeling • Minecarts now stop instantly when players exit • GUI stabilized and limited to valid rail support blocks • Optional TrainCarts integration for fully rail locked movement • Improved safety and compatibility with Paper and Spigot 1.21.11

• Fixed crash caused by zero-length velocity vectors
• Safe speed application to prevent "x not finite" errors

First stable version with GUI to add block from inventory to increase or decrease minecart speed per block type