Backported Minecarts

A mod that backports the minecart changes added in 1.21.2 **It adds:** -The ability for minecarts to jump from slopes. -A smoother looking animation when mid-air. -A fix to minecarts rotating incorrectly when the rail they are resting on are destroyed. -A fix to minecarts rotating their server-side yaw incorrectly. (mostly affects commands and datapacks) **NOTE:** 1.21 version works with Sinytra Connector (which is why it is labeled as a Neo/Forge mod) but not the 1.20.1 version for some strange reason  Also, version 1.2.0 is in beta, I lost the original source code but I try to make it more accurate to the 1.21.2+ minecarts with its rebuild.