MinecartSpeedUnlimiter

FIXES

Now minecart that isn't on rails have normal slowdownfactor

FEATURES

Now you can enable

 /gamerule usePotionTNTMinecartBuffing

and it will buff tnt minecarts if strenght potion thrown. Also you can change each potion power with

 /gamerule onePotionTntMinecartBuff 1

Values can be between 1 and 10. I can probably make it more powerful but it may make minecraft lag at explosion