Fix trailers friction and make them slowdown gracefully

[enricotagliavini]

This commit fix an issue reported multiple times such as

#450
#448

I tested this change in 1.16.5. I had to use a commit from a few days ago as the very latest from 1.16.X crashes my game and am not sure why as of yet.

Disclaimer: first time ever I try to code on a Minecraft mod, hopefully I've done nothing completely dumb :)

[enricotagliavini]

Oh I'm 19 hours late apparently, I see this might have been fixed already ^_^'''

EDIT: or maybe not. The code was changed to the new mappings(?), but I can't see any slowdown logic. Unfortunately I can't test the new code, I get a crash on world load

net.minecraftforge.fml.common.ObfuscationReflectionHelper$UnableToFindFieldException: java.lang.NoSuchFieldException: layers
	at net.minecraftforge.fml.common.ObfuscationReflectionHelper.findField(ObfuscationReflectionHelper.java:242) ~[forge:?] {re:classloading}
	at net.minecraftforge.fml.common.ObfuscationReflectionHelper.getPrivateValue(ObfuscationReflectionHelper.java:87) ~[forge:?] {re:classloading}
	at com.mrcrayfish.vehicle.client.handler.HeldVehicleHandler.patchPlayerRender(HeldVehicleHandler.java:43) ~[vehicle:0.45.2-1.16.3] {re:classloading}
	at com.mrcrayfish.vehicle.client.handler.HeldVehicleHandler.onRenderPlayer(HeldVehicleHandler.java:35) ~[vehicle:0.45.2-1.16.3] {re:classloading}
	at net.minecraftforge.eventbus.ASMEventHandler_54_HeldVehicleHandler_onRenderPlayer_Pre.invoke(.dynamic) ~[?:?] {}
	at net.minecraftforge.eventbus.ASMEventHandler.invoke(ASMEventHandler.java:85) ~[eventbus-4.0.0.jar:?] {}
	at net.minecraftforge.eventbus.EventBus.post(EventBus.java:302) ~[eventbus-4.0.0.jar:?] {}
	at net.minecraftforge.eventbus.EventBus.post(EventBus.java:283) ~[eventbus-4.0.0.jar:?] {}
	at net.minecraft.client.renderer.entity.PlayerRenderer.func_225623_a_(PlayerRenderer.java:63) ~[?:?] {re:classloading,xf:fml:forge:crossbows.2,pl:runtimedistcleaner:A}
	at net.minecraft.client.renderer.entity.PlayerRenderer.func_225623_a_(PlayerRenderer.java:41) ~[?:?] {re:classloading,xf:fml:forge:crossbows.2,pl:runtimedistcleaner:A}
	at net.minecraft.client.renderer.entity.EntityRendererManager.func_229084_a_(EntityRendererManager.java:251) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.client.renderer.WorldRenderer.func_228418_a_(WorldRenderer.java:1202) ~[?:?] {re:classloading,xf:fml:journeymap:WorldRenderer.markForRerender,pl:runtimedistcleaner:A}
	at net.minecraft.client.renderer.WorldRenderer.func_228426_a_(WorldRenderer.java:1010) ~[?:?] {re:classloading,xf:fml:journeymap:WorldRenderer.markForRerender,pl:runtimedistcleaner:A}
	at net.minecraft.client.renderer.GameRenderer.func_228378_a_(GameRenderer.java:608) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.client.renderer.GameRenderer.func_195458_a(GameRenderer.java:425) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.client.Minecraft.func_195542_b(Minecraft.java:976) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:607) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.client.main.Main.main(Main.java:184) ~[1.16.5-forge-36.1.18.jar:?] {re:classloading,pl:runtimedistcleaner:A}
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_292] {}
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_292] {}
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_292] {}
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_292] {}
	at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:51) ~[forge-1.16.5-36.1.18.jar:36.1] {}
	at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-8.0.9.jar:?] {}
	at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) [modlauncher-8.0.9.jar:?] {}
	at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72) [modlauncher-8.0.9.jar:?] {}
	at cpw.mods.modlauncher.Launcher.run(Launcher.java:82) [modlauncher-8.0.9.jar:?] {}
	at cpw.mods.modlauncher.Launcher.main(Launcher.java:66) [modlauncher-8.0.9.jar:?] {}
Caused by: java.lang.NoSuchFieldException: layers
	at java.lang.Class.getDeclaredField(Class.java:2070) ~[?:1.8.0_292] {}
	at net.minecraftforge.fml.common.ObfuscationReflectionHelper.findField(ObfuscationReflectionHelper.java:236) ~[forge:?] {re:classloading}
	... 27 more